| Subject | Date Asked |
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| find the ratio of speed | 7/23/2008 |
Q: On a straight road, an inspecting officer traveled from the rear to the front of an army column, and ...
A: If I correctly interpret....you are saying that in the time it took the soldiers to travel their own ...
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| Half life | 7/22/2008 |
Q: Polonium-210 has a half life of 138.4 days. A 268mg sample decays for 2 years(730 days). What amount ...
A: Let A(t)=the amount of Polonium-210 remaining after t days. Then A(t)=Ao*e^(kt)...since the 1/2-life ...
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| answer | 7/21/2008 |
Q: Mohan sold a watch to Tarun at 12% gain and Tarun had to sell it to manish at a loss of 5%. If ...
A: 2/5 should sell for 2/5 of 96000 = 38400, but he sold it a 6% loss. 6% of 38400 is 2304. So, he ...
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| answer | 7/20/2008 |
Q: Mohan sold a watch to Tarun at 12% gain and Tarun had to sell it to manish at a loss of 5%. If ...
A: Let x=the price paid for the watch by Mohan. So, Mohan sold it to Tarun for x + 12% of x = x + 0.12x ...
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| Word problems/ Algebra | 7/16/2008 |
Q: I am having difficulty creating the formula to solve word problems. For example:A traveling club ...
A: Let x=the number of people initially in the club. Thus, the initial cost per person is $150,000/x, ...
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| Math Word Problem finding current | 7/15/2008 |
Q: A motoboat heads upstream a distance of 12 miles on a river whose current is running at 5 miles per ...
A: Let x=the speed of the boat relative to the water. Thus, the actual speed upstream is x-5 miles/hr, ...
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| math | 7/12/2008 |
Q: melinda has 3pairs of red socks,2 pairs of black socks and 5 pairs of white socks . how many minimum ...
A: Are you sure you mean what is the "minimum" # that can be removed? Also, I gather she needs to be ...
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| how do i covert in the metric system | 7/11/2008 |
Q: I'm having a test monday and I'm having trouble converting.
A: The easiest way to do any conversions is to use what are called "unit fractions." That is, you ...
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| Help Solve | 7/7/2008 |
Q: 1.If you earned an average of $25,000 over your working life you retire after 2005 at 62, 63, or 64, ...
A: OOPS! Sorry, disregard my previous reply to this! OK... 1. Let x=age, y=SS benefit. Thus, ...
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| Help Solve | 7/6/2008 |
Q: After 2 minutes on a treadmill, Jenny has a heart rate of 82. After 3 minutes she has a heart rate ...
A: Let x=the time (in minutes), y=heart rate. Thus, we get the two ordered pairs: (2,82) & (3,86) ...
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| please tell me how to do it as soon as possible | 7/5/2008 |
Q: A salesman drove to portland a distance of 300 miles. during the last 80 miles of his trip heavy ...
A: Let x=the original speed (in miles/hr), thus x-15=the speed during the last 80 miles. Let t=the time ...
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| problem solving | 7/2/2008 |
Q: The midpoints of the sides of a square of side 1 inch are joined to form a new square. This ...
A: Clearly, the area of the first square is 1^1 ==> A1=1 The second square has sides sqrt(2)/2, so its ...
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| sine and cosine word problem | 5/23/2008 |
Q: Two sailboats leave a harbor in the Bahamas at the same time. The first sails at 22mph in a ...
A: After 5 hrs, the distance they have traveled is: The 22 MPH boat: 110 miles The 29 MPH boat: 145 ...
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| Word Problems | 1/22/2008 |
Q: Chicken Little was going to town to sell her eggs when she bubmped into Henny Penny, who wanted to ...
A: Let x=the number of eggs originally had. 1. she sold (1/2)x+(1/2) to Henny Penny, leaving -- ...
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| Cows | 1/18/2008 |
Q: In a group of cows and turkeys; the number of heads are 35 less than the number of legs what is the ...
A: Let c=the # of cows, and t=the # of turkeys Thus, the total number of heads is given by c+t, and ...
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| Sixth grade math problem | 1/17/2008 |
Q: My son has a "Problem of the Week" that has the whole family stumped. The school newspaper is ...
A: This is a standard problem in using Venn Diagrams. To get a little primer, check: ...
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| Alegebra 2 | 1/16/2008 |
Q: One electronic reader can read a deck of punched cards in 1/2 the time of another reader. Together ...
A: Let x=the rate at which the slower machine can read a deck Then x/2=the rate of the faster machine ...
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| Quiz Word problem | 1/15/2008 |
Q: Steve can write a quiz in 40 minutes. Steve and Ruth working together can write a quiz in 25 ...
A: ), Since work=rateXtime, Let r = the rate at which Ruth can work (alone) Steve can work at the ...
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| maths using qadratic equation | 1/13/2008 |
Q: some students went for the picnic total cost for the food was Rs 240. 4 students among the group ...
A: what is it?), Also, what is "Rs"? Anyhow...let x=the # of students who were supposed to go... ...
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| math word problems | 1/12/2008 |
Q: uhm, hi! i was wonderimg if you could help me with these? a lot said that ur really good.. thanks.. ...
A: ..what is it?), You have quite a list of questions! I'd rather not answer them all...it would take ...
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| dd | 1/11/2008 |
Q: 1.prove that the equation ax2(square)+2hxy+by2(square)=0 represents a pair of straight lines passing ...
A: 1. ax^2+2hxy+by^2=0...SOlving for y using the quadratic -- formuala: y=[-2hx(+ or -)sqrt(4h^2 x^2 ...
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| Math | 1/10/2008 |
Q: Ashley O'Shaughnessy won $5000 in a contest. She invested some of the money at 5% simple interest ...
A: Let x=the amount invested at 5%, then 2x-400=the amount invested at 6.5% Thus: (5% of x) + (6.5% of ...
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| math q | 1/5/2008 |
Q: The sides of the large square are 16 cm. The midpoints of the sides are joined to form a new square. ...
A: 1. do you mean the process (of joining midpoints and -- forming squares) is repeated until there are ...
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| taking 1000 or 10,000 steps | 1/4/2008 |
Q: Lao Tzu wrote, "The journey of a thousand miles starts with a single step." Okay, it's all good! ...
A: Depends on how long the step is! Suppose each step is x inches long, then the total ditance for ...
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| Ladder puzzle | 12/29/2007 |
Q: In order to keep his 15' ladder from bowing, a painter uses a 6'x6'x6' cube, jammed up against the ...
A: Sorry for the delay on this one...I needed a bit of time to type all of the following! I'll show ...
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| math equation | 12/26/2007 |
Q: Please help with this problem. Two cyclists start biking from a trail’s start 3 hours apart. The ...
A: The distance the 1st cyclist travels is 6(3+t) miles, and the distance the 2nd cyclist travles is ...
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| Word Problem ( Math ) | 6/7/2007 |
Q: you have just purchased new appliances worth $1900. you pay $700.00 down, and finance the remainder ...
A: Wow, I just found this question of yours from the summer! I had "been on vacation" from AllExperts ...
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| work problems | 6/1/2007 |
Q: A can do a piece of work in 10 days and B in 20 days. they work together ,but 2 days before the ...
A: "A" can do 1/10 of the job per day, and "B" can do 1/20 of the job per day. So, if they work ...
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| Trig | 5/31/2007 |
Q: An Egyptian pyramid has a square base and symmetrical sloping faces. The angle of inclination of a ...
A: Use th Law of Sines to determine the length of s sloping face. The triangle formed has a base of ...
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| maths | 5/29/2007 |
Q: i have 2 questions first there are 4 roads from A to B and 5 roads from B to C howm any possible ...
A: 1. There are 4x5=20 ways to get from A to C...and 20 ways - to get back... 2. A square of area 36 ...
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| please help me out | 5/28/2007 |
Q: 10 men & 6 children can complete a job in 2 days, 16 men and 16 children can complete the same job ...
A: Let x=the rate at which one man can work (job/day) and y=the rate at which a child works (job/day) ...
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| Word Problem-is there an easier way? | 5/24/2007 |
Q: I have a word problem that I can't figure out. Here it is- 'A girl went fishing. The first day she ...
A: What you have there is what is called a series, that is the sum of terms that have a constant ratio ...
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| Business | 5/23/2007 |
Q: Lotus Development has a software rental plan called SmartSuite that is available on the World Wide ...
A: The compound interest formula is: A=P(1+r/n)^(n*t) So we get: A=2.99(1+0.01)^40 + 2.99(1+0.01)^39 + ...
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| Adult Tutoring Ideas? | 1/4/2007 |
Q: Mr. Mantell, I am a safety professional working towards a National Certification (Certified Safety ...
A: How about Sylvan? Check for other in your local Yellow Pages, under "tutoring" or "Education"... ...
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| Algebra word problem: time/distance/rate | 12/30/2006 |
Q: Two airplanes leave a starting point traveling in the same direction, one at 550mph, the other at ...
A: The answer I obtained can easily be verified: The faster plane travels: : 550 (miles/hr) X 18/37 ...
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| Algebra word problem: time/distance/rate | 12/28/2006 |
Q: Two airplanes leave a starting point traveling in the same direction, one at 550mph, the other at ...
A: Let x=the distance the faster plane has traveled let y=the distance the slower plane has traveled ...
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| How many possible combinations? | 1/9/2006 |
Q: How many possible combinations are there in a 5 digit code using the numbers 1 through 6? Thanks!
A: Do you mean "combinations" or "permutations"? Is repetition allowed? If it is a true code, like a ...
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| College Algebra | 9/19/2005 |
Q: Need help with a word problem in algebra. A farmer spends $100 to buy 100 animals. Cows cost $10 ...
A: OK, your equations are correct. Now let's solve for z, using 10x+5y+0.50z=100 So, z=200-20x-10y. ...
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| limits with brackets | 9/11/2005 |
Q: What is the limit of [(x-2)] as x approaches 1.5? The answer is -1(as it says in the Kaplan AP ...
A: The bracket notation is commonly used for "The Greatest Integer Function" - see this site for more ...
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| Sheep Pen | 9/9/2005 |
Q: A sheep farmer had a sheep pen which was the shape of an equilateral triangle.The six sections he ...
A: The area of an equilateral triangle, in terms of it's perimeter (P), is: A1=[sqrt(3)/36]P^2 The ...
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| question needs to be solved before friday.....pleeeeeaaase!!! | 9/7/2005 |
Q: Here is a question i really need solved with explanation please. There are 16 boys in a class with ...
A: The algebraic way is: Let x=the height of the new student. The total height of all the students ...
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| 7 grade math | 9/6/2005 |
Q: You have 4 pieces of gold chain with 3 links on each. If it costs $10.50 to break a link and $10.50 ...
A: Well, I cannot draw a picture here...but I can explain it. The least expensive way is to use one of ...
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| Calculating force of water | 8/24/2005 |
Q: I could probably resurrect some old books for this one, but do not have the time... I think it is ...
A: This is a standard Calculus II problem..Here's how to solve it: One wall of the tank is 16' long by ...
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| Pacal's Triangle (Tower of Cubes) | 7/8/2005 |
Q: A tower of cubes is made of 35 cubes in five layers. How many cubes are needed to form a similar ...
A: The pattern is: 1 + 3 + 6 + 10 + 15 + ... That is: 1 + (1+2) + (1+2+3) + (1+2+3+4) + (1+2+3+4+5) + ...
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| asymptotes | 6/2/2005 |
Q: What are the equations of all horizontal and vertical asymptotes for the curve y=x/(x(x^2-4))(the ...
A: Vertical asymptotes occur where there is a division by zero...so, we solve x(x^2-4)=0, and get ...
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| % | 5/29/2005 |
Q: Three years ago men made up two out of every three internet users in America. Today the ...
A: Let x=the total number of Internet users 3 yrs ago. Thus, (2/3)x=the number of male Internet users 3 ...
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| From Pounds To Ounces | 5/27/2005 |
Q: It is quite common to divide two numbers with like units. This type of division, if I'm not ...
A: Doesn't the following: 4 ounces/16 ounces = 1/4, and doesn't this calculation represent how many 16 ...
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| From Pounds To Ounces | 5/26/2005 |
Q: I want to thank you for the follow-up reply. Regarding number 2., How many 16 ounces are in 1/4 ...
A: No, it would STILL NOT MAKE SENSE! If you are asking someone to calculate a number, it makes NO ...
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| From Pounds To Ounces | 5/25/2005 |
Q: Can you explain why 1 and 2 do not make sense? I thank you for your follow-up reply.Hello: 1/4 ...
A: 1. How many 16 ounces per pound are in 1/4 pounds? Does not make sense primarily because "16 ...
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| transformations | 1/21/2005 |
Q: What is the equation of y=x^2 + 4 after: (a)a dilation of 2 (b)a rotation of 180 degrees (c)a ...
A: a) dilaton in which direction...x or y? -- in y, it would be 2x^2+4 b) I'll assume rotations are ...
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| Ticket Problem | 1/16/2005 |
Q: It's me again. I really wanna get this problems right so before test I'm well prepared. I wanna ...
A: The first one- Let x=the # of times you ride the Ferris Wheel, and y=the # of times you ride the ...
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| Sequence | 1/13/2005 |
Q: Me again, I just asked you the question.. what is the missing value in the following sequence: ...
A: Oh yes, I am familiar with that website (http://www.research.att.com/~njas/sequences/)... and tried ...
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| word problem | 1/4/2005 |
Q: as you ride the ferris wheel, the height above ground varies sinusoidally with time. the ferris ...
A: Let the height above the ground be represented by h(t)=Asin(bt+c)+D So, A=41 ft (the radius of the ...
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| transformations | 1/2/2005 |
Q: So why am I wrong?why do you have to reflect it in the x-axis first?Please go to this web site and ...
A: OK, I somehow did not see (or notice) your minus sign on the 3! I thought you were doing the ...
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| transformations | 12/31/2004 |
Q: Please go to this web site and look at number 31. ...
A: No...You need to reflect (about x-axis) before the vertical shift of 3. So, one answer would be ...
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| Teeth on gears | 1/16/2004 |
Q: This is a question from Brainbashers.com. I have a machine which has four cog wheels in constant ...
A: Interesting question! What we need is the LCM (Least Common Multiple) of the 4 numbers: 242, 66, ...
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| Word problem for school, we are allowed to use any resource to figure out the solutions | 1/2/2004 |
Q: This is the word problem: A town is replacing its water supply lines. The current system uses two ...
A: Since volume of flow is cross-sectional area times the flow rate. I assume the problem is to find ...
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| algebra finance | 7/29/2003 |
Q: An asset is purchased for $15,000 and depreciates at 12% per year. How long will it take to ...
A: The value is given by, V(t)=$15,000(1-0.12)^t, t=# of years ==> V(t)=$15,000(0.88)^t, now solve for ...
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| Gallon Capacity | 7/26/2003 |
Q: How would we figure out how many gallons an above ground round pool holds so we can figure out the ...
A: The volume of a cylinder is pi*h*r^2, where h=height of water, and r=radius of the pool Convert the ...
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| Word Problem | 7/26/2003 |
Q: Abe, Hi! I am stumped on two questions in my assignment and was wondering if you could help. Any ...
A: 23. Let I=intensity, and x=distance. So, I=k/x^2, where k=constant of proportionality. When ...
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| water hoses | 7/11/2003 |
Q: Two hoses are filling a swimming pool. The hose with the larger diamter supplies 1.5 times as much ...
A: OOPS! Sorry, I pressed the wrong response before! Anyhow...Hello Charisma (is that your real ...
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| How to research? | 7/11/2003 |
Q: How to research? --- I am a student in Computer Science department and I wonder how can I increase ...
A: Wow, tough question to answer! In my opinion, when you learn (not just memorize facts, but actually ...
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| Algebraic Word Problem-Quadratic Systems | 6/13/2003 |
Q: I have two algebraic word problems that have me stumped, and I would like you to help me solve them. ...
A: 1. Let x be the base and y be the height... So, (1/2)xy=2a^2-2b^2, and x^2+y^2=4(2a^2+2b^2) ...
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| Word problems | 5/31/2003 |
Q: I am currently homeschooling my two teenagers. I am pretty good with Algebra, but I just can't ...
A: How about I show you the first one, and give you a chance to do the other...OK? Let x=the rate at ...
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| Word problem | 5/29/2003 |
Q: One rental car agency charges $40 per day plus 15 cents per mile for a midsize car. Another agency ...
A: Let m=# of miles driven... Agency 1: charges 40 + 0.15m dollars/day Agency 2: charges 45 + 0.10m ...
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| formula or pattern for rearrange letters or numbers. | 5/8/2003 |
Q: I was wondering if there was a formauls for finding the number of ways something can be reaaranged ...
A: There sure is! n distinct items can be arranged in n! ways (it's called "n factorial")...and ...
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| Help | 5/1/2003 |
Q: It takes you 30 sec. to walk from the first floor of a building to the third floor. How long will it ...
A: Since one must walk up 2 flights of stairs (from the 1st to 3rd floor), we assume a person can ...
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| word problem - yikes | 4/30/2003 |
Q: I got this problem from my teacher because I needed an extra point for the week. But I think I'm ...
A: Certainly the twins are the same age...so the worst pitcher and his/her twin are is also the same ...
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