You are here:
- Home
- Science
- Math for Kids
- Basic Math
Basic Math/Questions Answered by Expert Abe Mantell
| Subject | Date Asked |
| General History of Math | 1/22/2012 |
| Q: Who in your opinion is comparable to Carl Friedrich Gauss, as a Mathematician rather than as a ... A: Certainly Leonard Euler has to be considered as one of the greatest mathematicians of all time (if ... | |
| Rates | 12/25/2011 |
| Q: Here is my15 workers can finish a job in 7 days. If I want to find the number of days 21 workers ... A: We can think of the (15 workers)x(7 days) = 105 worker-days as the amount of work needed to complete ... | |
| Mathematica - Scientific,Engineering and Mathematical fields | 8/18/2011 |
| Q: Looks like a Excellent Program for mathematical modeling and visualization. ... A: Yes, Mathematica is a wonderful tool for doing and visualizing mathematics! I use a similar product ... | |
| Proportion Meaning | 8/12/2011 |
| Q: If 5 concrete bricks weigh 20 lbs. what is the weight of 15 bricks of the same kind? I determined ... A: I do not know if the product has a special name or significance. The only practical interpretation ... | |
| Hours of work | 8/8/2011 |
| Q: I worked the following what are my hours that I can bill 8.45 - 5pm with a 40 minute lunch break ... A: > 8.45 - 5pm with a 40 minute lunch break 8 hrs 15 min - 40 min = 7 hrs 35 min > 8am - 5pm with a ... | |
| Percentages | 8/5/2011 |
| Q: Is 9.1% and 9.10% the same? For example, if the employment rate is 9.10% can this percentage be ... A: Numerically 9.1 and 9.10 are the same. However, they imply two different accuracies. 9.1 could be ... | |
| Mirrored Numbers - (Exact Replica of the Number) - Optics & Real Life Use ? | 7/26/2011 |
| Q: What i observe by looking at the Numeric Whole Numbers(Integers) in Mirror (Glass) Object are the ... A: "Mirrored Numbers" have vertical symmetry. I would definitely NOT classify such numbers in any way ... | |
| Please hep with my fractions. Xxxo | 7/24/2011 |
| Q: 27. Simplify: (x+3/ 5) - ( 2x+1/10) 28. SImplify: (x+3/5) + (x-2/2x) 32. Simplify: 1/p^2 - 1/q^2 ... A: Should the fractions be (x+3)/5 instead of x+3/5? I think so... 27. Simplify: ... | |
| curious | 7/20/2011 |
| Q: If one million people died in one year in a country where the population was ten million, how many ... A: If 1,000,000 ppl died in a year, then just divide that by the number of minutes ina year to get the ... | |
| Rates | 7/12/2011 |
| Q: If an automobile can travel 50 miles in one hour (60 minutes), how long will the same automobile ... A: I gather the question should be: "How long will it take to travel the SAME DISTANCE at 80 MPH?" ... | |
| I'm having such a hard time with Fractions. | 7/7/2011 |
| Q: 8. Simplify: x^4-2x^2y^2+y^4/x^4-x^3y-xy^3+y^4 10. Simplify: z(z-1)= z(z+1) 22. Simplify: ... A: You have many questions here. I'll just answer the first few. Try the others, if you need help, ... | |
| algebra | 6/11/2011 |
| Q: solve x 7x -16 < 8x +2 A: Inequalities are solved just like equalities, except when multiplying or dividing by a negative ... | |
| Food Math | 6/7/2011 |
| Q: I decided to mix colors when mixing jello mix. Each box contains 3oz and requires 1 cup of water ... A: Convert 0.7333333 to a fraction? Do you mean a "standard" fraction that you would see on a ... | |
| probability | 1/14/2011 |
| Q: At an electronics plant ,It is known from past experience that the probability is .90 that a new ... A: We can express the information as: M=worker has met production quota T=worker attended training ... | |
| time and work | 1/10/2011 |
| Q: ronald and elan are working on an assignment. ronald takes 6 hours to type 32 pages on a computer ... A: Ronald works at a rate of 32 pages per 6 hrs ==> 32/6 pages/hr = 16/3 pages/hr Elan works at a rate ... | |
| Math | 1/3/2011 |
| Q: how would you add 7/10, 5/8, and 7/20? A: First obtain a common denominator, which is the the same as a common multiple of all the ... | |
| Percent-Day Method & Simple Interest | 12/30/2010 |
| Q: I read about this method in an old business mathematics book and was curious about how it works to ... A: The "correct" and simplest way to do it and think about is: $720 x 7% x 92/360 = $12.88 Here's why. ... | |
| Dollars & Cents | 12/26/2010 |
| Q: Why are different units (dollars & cents) mixed together when monetary amounts are used? For ... A: My guess is that since we have currency/coins that are fractions of a dollar (i.e. different cent ... | |
| 6th grade math | 9/1/2010 |
| Q: i am a dad trying to help my daughter with math homework and she is starting to exceed my knowledge ... A: 1. 4x-2x+4=x+10, we first combine "like terms" . i.e. 4x-2x=2x (4 x's minus 2 x's leaves us with 2 ... | |
| High Risk Funds | 8/29/2010 |
| Q: Sara received $50,000 from a real estate deal. She gave $2000 to charity. She invested part of the ... A: Let x=the amount from the remaining $48,000 Sara invested at 16% then $48,000-x is the amount she ... | |
| decimls | 8/28/2010 |
| Q: I am about to explain to my 9 y.o. what is decimal, and I have no idea how to start. Any ideas? I ... A: Is your child familiar at all with money? That might be a good way to introduce decimal ... | |
| hello sir | 8/27/2010 |
| Q: How can v faid 100! value without multiplying all the numbers individually... is there any shortcut ... A: I think you meant to ask "How can WE FIND 100! without multiplying all the numbers out?" Yes? We ... | |
| math | 8/24/2010 |
| Q: the area of a rectangular hallway is 120 square feet.if the lenth and width are both composite ... A: Are you sure you mean "composite" numbers and not "whole" numbers? A composite number is a number ... | |
| Ratios & Rates | 8/21/2010 |
| Q: Is a ratio an inclusive term for a fraction and a rate? Units of measure accompany the terms of a ... A: Fractions often do include units to give them more meaning than just a unitless ratio. The example ... | |
| How to caluculate my grad in a subject so far? | 8/19/2010 |
| Q: How do i Calcuate my grade so far for a subject? my grades and percentages (of what they are worth ... A: So far, you have 65% of your grade, as follows: 1/5 = 20% worth 5% of your grade 85/100 = 85% worth ... | |
| Math | 8/17/2010 |
| Q: The quotient of 2 is the same as the first factor what do you know about the 2 factor and how. A: The wording of your question is lacking clarity. Do you mean: The quotient of 2 NUMBERS is the same ... | |
| A Maths Toughy- Perfect Squares Question | 8/14/2010 |
| Q: A Friend of mine challenged me and some of other friends if we could answer a question. He said - I ... A: So, you want 4 whole numbers so that the sum of any 2 or all 4 of them are perfect squares...yes? ... | |
| matrixes | 6/4/2010 |
| Q: A linear transformation maps (5,2) to (1,-1) and (2,1) to (0,-4). Find the matrix associated with ... A: Not knowing what techniques you have already learned, here is one way to do it. Lat the matrix of ... | |
| Rates | 1/6/2010 |
| Q: Ok, this is the question. *Elizabeth can run 5 miles in 2/3 of an hour. At this rate, how long does ... A: We can set-up a ratio with distance/time=distance=time So, 5/(2/3)=1/x, where x is the time required ... | |
| Sales Tax | 1/3/2010 |
| Q: If a 20 ounce fountain drink costs $0.89, and the sales tax is 7%, the conventional method for ... A: You also had "/20 ounces"...so if you remove that from your equation, I am OK with it. If you keep ... | |
| Sales Tax | 1/2/2010 |
| Q: If a 20 ounce fountain drink costs $0.89, and the sales tax is 7%, the conventional method for ... A: Yes, the right-hand side (RHS) of an equation refers to the RHS of the equals sign, similarly the ... | |
| Sales Tax | 1/1/2010 |
| Q: If a 20 ounce fountain drink costs $0.89, and the sales tax is 7%, the conventional method for ... A: While you get the correct number, technically it is not correct since the units do not match. ... | |
| math?? | 12/31/2009 |
| Q: I cant remember how to do ratios.. i could use a quick review.. example: find the value of x ... A: Ratios can be set-up as equations with fractions. In general, if a:b::c:d ==> a/b=c/d Thus, 0.5/x = ... | |
| math | 12/27/2009 |
| Q: (1/(1*2))+(1/(2*3))+(1/(3*4))+........+(1/(n(n+1))) proof (1/(1*2))=(1/n)-(1/(n+1)) ... A: It is what is called a "telescoping series"...as almost all of the terms "cancel"... 1/1 - 1/2 + ... | |
| coordinate geometry | 12/25/2009 |
| Q: please can you explain to me how to solve these questions.thanks. 1, find the equation to the ... A: 1. Do you mean the equation of the line that passes through (2,1) and the center of the circle? If ... | |
| Factoring using common factors, difference of 2 squares difference of 2 cubes | 8/13/2009 |
| Q: Can you please help me with this, I'm confused. (step by step break downs would be great, if you ... A: 3. Factor the following expressions using the method of common factors. (a) 6a+6c, factor out ... | |
| math word problem | 8/11/2009 |
| Q: A rectangular swimming pool is four times longer than is wide. The pool is surrounded by a deck that ... A: Let x=the width of the pool (in meters), then 4x=the length. The rectangular deck is x+6 meters wide ... | |
| poisson distribution | 7/22/2009 |
| Q: when tossing a unbiased ,find the probaility that 1)the first head occurs on the third trial 2)at ... A: 1. P(x=0)=(e^-5)(5^0)/0!=e^-5 or about 0.006738 2. Let x=# of calls for the first minute, and y=# of ... | |
| LENGTH | 7/19/2009 |
| Q: Which is the shortest length, 5/16, 1/4, or 1/6? A: With a calculator, or by hand using long division, you can convert each one to a decimal to see: ... | |
| math word problem | 7/17/2009 |
| Q: I have the following problem: Two people A & B start walking towards each other by road connecting ... A: Let a=the rate at which person A travels (units/minute) and b=the rate at which person b travels. ... | |
| SOLVE THE FOLLOWING EQUATION USING MATRIX MANIPULATION | 7/14/2009 |
| Q: 5X^2+3Y^2-Z^2=32 2X^2-3Y^2+2Z^2=32 -X^2+3Y^2-3Z^2=-64 FROM THE ABOVE EQUATION FIND VALUE OF ... A: Your notation is a bit off, it should be: p(E|S)=80/100=0.8 p(E|R)=40/100=0.4 P(E|L)=60/100=0.6 So, ... | |
| SOLVE THE FOLLOWING EQUATION USING MATRIX MANIPULATION | 7/13/2009 |
| Q: 5X^2+3Y^2-Z^2=32 2X^2-3Y^2+2Z^2=32 -X^2+3Y^2-3Z^2=-64 FROM THE ABOVE EQUATION FIND VALUE OF ... A: Since each variable appears as "squared," we can think of this as a linear system in terms of x^2, ... | |
| Maths Problem | 7/10/2009 |
| Q: My question is: A positive integer n is such that numbers 2n+1 and 3n+1 are perfect squares. Prove ... A: Since 2n+1 and 3n+1 are perfect squares, they can be written as: 2n+1=a^2 and 3n+1=b^2, where a, b ... | |
| linear- perpendicular lines | 7/9/2009 |
| Q: How do I find the equation of a line that is perpendicular to another line with equation x-3y=5 and ... A: Rewrite x-3y=5 as -3y=-x+5 then y=(1/3)x-5/3, so the slope is 1/3. Since perpendicular lines have ... | |
| equation | 7/7/2009 |
| Q: 1) If x(2x+1)=0 and (x+1/2)(2x-3)=0, then x=? 2) For what values of 'k' will the pair of equations ... A: 1) x(2x+1)=0 gives x=0 or x=-1/2, (x+1/2)(2x+3)=0 gives x=-1/2 or x=-3/2 .. so the only value in ... | |
| work problem | 7/6/2009 |
| Q: if a person can pull 17 parts in a hour and same person can pack 20 parts in a hour how many he can ... A: Do you mean how many can he "pull" and then "pack" if he must pack all the ones he pulls? If so, ... | |
| Subtracting Decimals | 6/9/2009 |
| Q: I am trying to figure how to solve decimals with nothing to borrow from. Ex... 0.0025 - 0.075, 0.9- ... A: How did you get 0.0025 - 0.075 = 0.075 ??? It should be -0.0725 When you subtract a larger number ... | |
| Vectors | 5/27/2009 |
| Q: I am in a car moving from left to right and it's raining.The rain drops appear to fall towards my ... A: This question has been pondered by many! Here are some links that address the situation. ... | |
| Interest Calculation | 5/26/2009 |
| Q: How would most mathematicians solve the following: Determine the annual interest rate on $1,200 for ... A: Depends on if the interest is compounded or simple, and if compounded then how often? Do you know? ... | |
| Probability | 5/25/2009 |
| Q: My name's Danielle. My 7th grade class is doing probability and I'm stuck on a homework question. ... A: Hmm, seems like more information would be needed. Are we to assume that the cost will be $2 plus ... | |
| Business Calculations | 5/23/2009 |
| Q: I need help calculating this problem. It's a 3 part-I have an average wage of $6.45/hr and use 985 ... A: - I gather that you mean the labor wages must be 7% of sales, yes? ..if so, then let x=the total ... | |
| algebra | 1/12/2009 |
| Q: How do you simplify? what are the basic rules? IE A: Sorry, I thought I answered this already...hmm, oh well! Try these sites for some general ideas: ... | |
| basic triginometry | 1/9/2009 |
| Q: I have a Trig question. Since I graduated 30 years ago, I cant remember how to do this. Everyday I ... A: All you need to know is right triangle trig...the mnemonic SohCahToa. Since you know the angle (12 ... | |
| math word problem help | 1/8/2009 |
| Q: If the commission rate is 6%, find the commission earned by an appliance salesperson who sells a ... A: Since the commission is a percentage, all you need to do is find 6% of the total sales, which is ... | |
| math | 1/3/2009 |
| Q: What is a outlier? They are asking if the table of numbers which are 55 73 42 81 73 150 65 55 20 68 ... A: When arranged in numerical order, we get: 20, 42, 55, 55, 65, 68, 73, 73, 81, 150 I would say 150 ... | |
| Math word problem | 1/2/2009 |
| Q: How do I solve this problem, please? Person A can paint a house in 4 hours, and person B can paint ... A: We know that Work=Rate x Time, and Person A has a rate of 1 job in 4 hrs, or 1/4 of a job/hr. Person ... | |
| Percentage | 12/29/2008 |
| Q: What was the difference between the highest and lowest unemployment rate amongst the group of ... A: 1990 Rates: Private=1475/(155+1475)=1475/1630 or about 90.49% State=1610/(125+1610)=1610/1735 or ... | |
| algebra | 12/27/2008 |
| Q: When milk is 3.15 a gallon, the store sells 3212 gallons. When milk is 2.85 a gallon, the store ... A: Let's list the ordered pairs: (3.15, 3212) & (2.85, 3728) Now find the equation of the linear ... | |
| parallelogram area | 9/2/2008 |
| Q: My ninth grader came home from his frist day in physics with this question...Samuel will use stamped ... A: There is a nice formula for this...the area of a parallelogram is: A=a*b*sin(C), where a and b are ... | |
| Math is my sore subject can you help me? | 7/17/2008 |
| Q: I'm only 13 and i really suck at math, can you please go over my answers correct them, & explain why ... A: Wow, you have many questions! Usually I would not answer so many at once, but I'll make an ... | |
| Watt-Hours | 7/16/2008 |
| Q: An electric light bulb, for example marked “ 60 watts“, indicates that the bulb uses 60 watt-hours ... A: Miles per hour per hour would represent a rate of acceleration. For example, 10 miles/hr per hr ... | |
| Watt-Hours | 7/15/2008 |
| Q: An electric light bulb, for example marked “ 60 watts“, indicates that the bulb uses 60 watt-hours ... A: Well, if the bulb consumes 60 watt-hrs of power in one hour, then the rate of power consumption is ... | |
| Math | 7/9/2008 |
| Q: How do you know when an equation has infinitely many solutions? How do you know when an equation has ... A: When you get something that is always true, there are INFINITELY many solutions. For example: ... | |
| fractions | 1/19/2008 |
| Q: Hope you can help me. I do not understand fractions at all. Can you please tell me, how do you ... A: Fractions represent ratios. For example: If I have 5 apples, and you have 10...then the ratio of ... | |
| Percents & Sales Tax | 1/18/2008 |
| Q: If the sales tax on merchandise sold in stores is 6%. The item is multiplied by the sales tax of 6%. ... A: 1. Percentages, by definition, are unitless. 2. 6 gallons/2 = 3 gallons...that represents an ... | |
| Percents & Sales Tax | 1/14/2008 |
| Q: If the sales tax on merchandise sold in stores is 6%. The item is multiplied by the sales tax of 6%. ... A: It is not 6% per dollar, it is just "6%"...which amounts to 6 cents per dollar. Remember, ... | |
| Alegbra question | 1/11/2008 |
| Q: What might function notation be important? Thanks Maria A: I gather you meant "Why" might function notation be important...yes? Mostly a notational ... | |
| Percents & Percentages | 1/10/2008 |
| Q: 0.3% is expressed as 3/10 of 1%. Is it correct to also express 0.3% as 3/10 of 1 percentage point? ... A: As long you are talking about percentages, then yes... 1% = 1 percentage point. If you wanted to ... | |
| PreCalculus real solutions | 1/8/2008 |
| Q: I am in high school taking a PreCalc course and am having trouble. My teacher doesn't know how to ... A: Sorry to hear your math teacher is not good at explaining things. :-( FYI: Common notation for ... | |
| probability again | 1/3/2008 |
| Q: This may sound similar to the last question I asked but it is not. Please take a look if you can. ... A: We want: ONE Jack, ONE Queen, and ONE King Since there are 4 of each, there are 4*4*4=64 ways of ... | |
| Algebra | 1/1/2008 |
| Q: I do not remember how to use the Y and X graph to work a problem The question is x=1, x=0, and ... A: Is there a diagram to go along with this? The question has to be incomplete. There is not enough ... | |
| probability | 12/29/2007 |
| Q: I am having difficulties understanding this problem and can't seem to get a correct answer, even ... A: Consider the number of ways of selecting 3 Jacks: since there are 4 Jacks, there are C(4,3)=4 ways. ... | |
| word equations | 6/8/2007 |
| Q: A cable service is being installed in a new subdivision. The cable must cross a 12 m wide river and ... A: Wow, I just found this question of yours from the summer! I had "been on vacation" from AllExperts ... | |
| medical intake and output | 6/5/2007 |
| Q: 1 cup of coffee that = 200 cc's and if a person drank 1/3 cup what would that equal to in cc's? also ... A: Using your info that 1 cup = 200 cc then 1/3 of a cup = (1/3)*200 cc = 66.67 cc I gather you meant ... | |
| Math problem | 6/4/2007 |
| Q: How many cubed pieces of fudge that are 3 inches on an edge can be packed into a Christmas tin that ... A: Since 3 divides 9 3 times, we can get 3 pieces along the 9 inch side... 3 divides 12 4 times, we can ... | |
| graphs | 5/29/2007 |
| Q: How do I set up the equation of (-8,7) with a slope of 6? I was helping my son and I just can't ... A: What you seek is the equation of a linear function... Two popular ways: 1. y=mx+b, where m=slope, ... | |
| Deficient Number | 1/8/2007 |
| Q: How do I describe in vocabulary form what a deficient number is and what an abundant number is? A: deficient number - A positive integer the sum of whose divisors, including 1 but excluding itself, ... | |
| standard deviation | 1/3/2007 |
| Q: I am trying to calculate the new standard deviation when data from two groups is combined. Group 1: ... A: I will assume the SD's you gave are "sample SD's"...OK? So that the sample SD formula is: ... | |
| Using math in business | 1/2/2007 |
| Q: What is the importance for a business person to be able to add, subtract, multiply, and divide? A: If for no other reason, people in business deal with money! I hope you can see the importance of ... | |
| Average | 12/26/2006 |
| Q: Not too lateto answer...any input is appreciated!I am calculating personal risk factors and looking ... A: In a case like this, an average does not seem appropriate. How about just a total? Either a direct ... | |
| Determine Cost Per Can | 6/1/2006 |
| Q: Is there a calculation to use to convert (3 cans)/($4.00) to ($4.00)/(3 cans) without simply ... A: What do you mean by "calculation"? (3 cans)/($4.00) = 3/4 of a can per dollar, tells you how much ... | |
| inequalities | 1/4/2006 |
| Q: Why does the inequality sign need to be reversed when both sides are divided by a negative number? A: Consider a simple example: Certainly 1<2, yes? Now if we multiply by -1, we need to compare -1 to ... | |
| please tell me the simplest... | 12/30/2005 |
| Q: please tell me the simplest way to solve the following problem. (Mr sim pays $337.50 for a number of ... A: Let x=the number of files purchased, and let y= the cost per file. Thus, 1. xy=337.50, and 2. ... | |
| graphing equations | 12/29/2005 |
| Q: How do you draw graphs? ex)2y=x+3 y=1/2x+2 y=2x-1 How do you find the y-intercept and the ... A: For graphing linear functions, check these sites: ... | |
| FRACTIONS | 9/16/2005 |
| Q: HOW DO THEY GET 4/11 X 22/36= 4/1 X 2/36 = 1/1 X 2/9 = 2/9 WE DON'T GET HOW THEY GET TO 1/1 X 2/9 = ... A: ..how many are you??), It does not look that good in typed form, but: (4/11)x(22/36) can be reduced ... | |
| Algebra for my HS daughter | 9/15/2005 |
| Q: Seems I have forgot a lot since algebra class. (30+ years ago) Every time I try to solve the ... A: First, that is not an equation...for it to be an equation it must have an equal sign in it...i.e. it ... | |
| algebra 2 | 9/11/2005 |
| Q: 1. simple interest solve for r:I=Prt 2.height of an equilateral triangle solve for s:h=V3S/2 ... A: 1. Divide by P and t, to get: r=I/(Pt) 2. (I'll use sqrt(3) for the "square root of 3") -- ... | |
| Complex Decimals | 9/8/2005 |
| Q: When you expressed 6, the non-zero portion of the decimal in 0.00006, in fractional form, why is ... A: I was simply using the notation you had in your original question. I have NEVER seen this before, ... | |
| Complex Decimals | 9/5/2005 |
| Q: 1. I can express the complex decimal of (0.00)1/2 (1/2 of 1/100) as 1/200 and then to 0.005, but I ... A: I've never seen decimals expressed that way in any math, physics, or engineering book or ... | |
| quiz | 9/3/2005 |
| Q: Abe, Thanks for your answer. What concerned me was the wording "Women paid just $5" with no mention ... A: Yes, you are being too picky...it is implied that the tickets for women are $5 EACH. What makes the ... | |
| Pythagoras' Theorem | 8/26/2005 |
| Q: I decided to take two math classes because I though I could jump of head so I decided to take ... A: Sure, I'll help...I need to know what the problem(s) are though! As for taking more math in ... | |
| 1/2% & 1/200 | 8/23/2005 |
| Q: If a surgeon performed an operation that cured all patients except for 1/2 of 1% of those patients ... A: Good question! What you say is true, unless...we round-off! Suppose 1 out of 134 people did not ... | |
| Matrices | 8/22/2005 |
| Q: if matrix A= [ 2 5 -1 ] [ 3 -2 0 ] and matrix B= ... A: First, this is not Basic Math...you should ask this in the Linear Algebra section. Anyhow, in order ... | |
| straight line equations | 6/1/2005 |
| Q: mantell, i have been searching many sites to help me with the y-intercept formula and i went to ... A: This example shows a line with a slope of -2/3, which contains the point (1,2). 1. substituted x=1 ... | |
| about residual sphere's volume | 5/29/2005 |
| Q: i found this question in a website. though it has an answer there, i don't really understand it. A ... A: Interesting question! Since the radius of the sphere is not given, it must not matter! Thus, ... | |
| algebra | 5/26/2005 |
| Q: how do you solve these step by step without using a calculator..i have the answers but i don't know ... A: 1. The diagonal AC is the hypotenus of a right triangle with legs 3 and 3...by the Pythagorean ... | |
| Fractions | 2/3/2005 |
| Q: Hi how do you add and subtract fractions? A: When adding and subtracting fraction, we need to have a common denominator. For example: 3/4 + ... | |
| Scale Factoring | 1/31/2005 |
| Q: This is Natalie's Mom. The only thing we can find in the chapters of her grade 8 math book is scale ... A: Well, the "circle graphs" are more commonly known as Venn Diagrams...do you need help with that? As ... | |
| re solving equations involving radicals | 1/29/2005 |
| Q: i am completely lost at how to solve these type of problems ex: (sq.root x-5) - (sq.root x-8)=3 A: We need to eliminate the square root signs... so, square both sides: [sqrt(x-5)-sqrt(x-8)]^2=3^2 ... | |
| a GRE question | 1/24/2005 |
| Q: I did not know where I could post this question, but since this question is categorized as an ... A: Sure, no problem... We cannot tell from the info provided. We have no idea what percentage the 500 ... | |
| Derivatives of logarithmic functions | 1/23/2005 |
| Q: I need to use logarithmic differentiation to find the derivative of (X^y)=(Y^x). I run into trouble ... A: Right, we cannot isolate y, so that is one reason for logarithmic differentiation... ... | |
| ALgebra help | 1/21/2005 |
| Q: I have a few math questions I am having trouble with. I was wondering if you could show me how to do ... A: Hell Rachel, 1. 9(n+2)=n+26, distribute the 9 on the left side -- 9n+18=n+26, now subtract n on ... | |
| prcnt. | 1/20/2005 |
| Q: i have no idea hoe to do precentages. please help. A: Check these sites for good help: http://www.learningincontext.com/Bridges/chapt07.htm ... | |
| Decimal and significant figures. | 1/16/2005 |
| Q: Why do you round up when you have something like 0.55 (e.g., to 0.6 for one decimal place)? Surely ... A: Good question! As far as I know, the "rule" to round-up when the digit is exactly "5" is somewhat ... | |
| Finding Least Common Multiple | 1/13/2005 |
| Q: I am not really (insistent) on using this method for more than two fractions. I am simply curious ... A: I was only confused by your "curiosity" because I felt I already answered your question...so I will ... | |
| Finding Least Common Multiple | 1/11/2005 |
| Q: The following calculation can be used to determine the least common multiple (lcm) of two fractions ... A: The reason it does not work (in general) with more than 2 denominators is because each denominator ... | |
| Sets | 1/10/2005 |
| Q: U is the universal set and A and B are two subsets of U. #U=u, #A=a, #B=b, #(A n B)=x, #[(A u ... A: Well, it is tough for me to give a Venn diagram here!!! But I'll try to explain it anyhow... [I'll ... | |
| Formulas | 1/7/2005 |
| Q: I am a 50 year young person having recently been accepted into a nursing program at my local ... A: Well, what you ask is rather a tall order! Math is not about formulas, it is about understanding! ... | |
| X=4Y+5 X=3Y-2 what do... | 1/5/2005 |
| Q: X=4Y+5 X=3Y-2 what do i do i no i have to solve for x or somethin im not sure 3X-5Y=11 X-3Y=1 ... A: One way to solve these is to take one of the equations and solve for one of the variables... then ... | |
| Dear Abe i would like to know... | 1/4/2005 |
| Q: I'm not an student I just start reading something about algebra and i have this question. please can ... A: If you express a parabola as: y=a(x-h)^2+k, then if a<0 the parabola is "upside down" the larger |a| ... | |
| how do I do it? | 12/31/2003 |
| Q: My question is, I'm weak in Math and would like to be able to improve and be very good at any math, ... A: Sounds like you are doing the right hings. Starting with the basics like pre-algebra, then algebra, ... | |
| algebra | 8/21/2003 |
| Q: What is the difference between an algebraic expression and an equation? Thanks so much! A: An expression is just a collection of symbols (variables, numbers, functions, etc.) An equation ... | |
Basic Math
Answers by Expert:
Abe Mantell
Top Expert on this page
Expertise
Hello, I am a college professor of mathematics and regularly teach all levels from elementary mathematics through differential equations, and would be happy to assist anyone with such questions!
Experience
Over 15 years teaching at the college level.
Organizations belong to
NCTM, NYSMATYC, AMATYC, MAA, NYSUT, AFT.
Education/Credentials
B.S. in Mathematics from Rensselaer Polytechnic Institute
M.S. (and A.B.D.) in Applied Mathematics from SUNY @ Stony Brook
©2012 About.com, a part of The New York Times Company. All rights reserved.