| Subject | Date Asked |
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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: ...
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| 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 ...
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| 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 ...
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| 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, ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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. ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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, ...
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| 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, ...
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| 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: ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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. ...
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| 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: ...
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| 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 ...
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| 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 ...
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| 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") -- ...
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| 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, ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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, ...
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| 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 ...
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| 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 + ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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... ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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! ...
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| 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 ...
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| 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| ...
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| 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, ...
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| 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 ...
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