| Subject | Date Asked | Expert |
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| maths | 11/8/2009 | Scott A Wilson |
Q: 1.find a fraction which reduces to 2/3 when 3 is added to both its numerator and denominator, and ...
A: 1. Let the fractioin be x/y. (x+3)/y = 2/3 and (x+1)/(y+1) = 3/5. The first one says that 3(x+3) = ...
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| Missing digits | 11/7/2009 | Scott A Wilson |
Q: Problem: The sum of unused digits is 16 T E N T + S I T E __________ S L E E P ANSWER: S ...
A: The three sets of numbers I gave you were A) 0,1,3,6,7,8,9 B) 0,1,2,4,5,8,9 and C) 0,1,4,5,6,8,9 ...
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| Trig | 11/7/2009 | Scott A Wilson |
Q: I need help with this word problem, please: A building contractor is planning to use a ladder to ...
A: Most the time if the ladder reaches the bottom of the window that's OK, so if the ladder is 18' and ...
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| Word Problems | 11/7/2009 | Scott A Wilson |
Q: 1. Find the two real numbers whose sum is 18 and whose product is a minimum. 2. Find the two real ...
A: 1. x+y=18, so y=18-x; maximize f(x) = x(19-x) = 19x - x² by solving f'(x) = 0. 2. x+y=24, so ...
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| need a solving | 11/6/2009 | Scott A Wilson |
Q: britney steals Jill's skateboard and the skateboard is going 35 mph and it takes Jill 20 seconds to ...
A: You've got to look at the units. 35 mph is 35 miles/hour. Now there is 1 hr/60 min and 1 min/60 ...
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| Rate Distance problems | 11/6/2009 | Scott A Wilson |
Q: This is a question my son cant figure out and I cant help can you please. At 9:30 a.m. Andrew left ...
A: At 10, A has gone 6 miles, so there are 14 miles left between them. The speed combined is 12+16 = ...
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| word problem | 11/5/2009 | Scott A Wilson |
Q: a student has 100 coins totaling $5.00. The student has no nickels, what coins does the student ...
A: This would mean that 60 of the coins are pennies, so that leaves 40 coins and $4.40. 40 dimes would ...
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| Missing digits | 11/4/2009 | Scott A Wilson |
Q: Problem: The sum of unused digits is 16 T E N T + S I T E __________ S L E E P
A: S has to be a 1, since there is 1 more digit in the answer and the sum of two distinct digits is no ...
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| need help getting the equation | 11/4/2009 | Scott A Wilson |
Q: The feed company sells 1 ounce package containing a mixture of lettuce seeds. Green stem seeds sell ...
A: Let p be the percentage in that one ounce package of green stem seeds. This makes 1-p the percentage ...
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| Transformations | 11/4/2009 | Scott A Wilson |
Q: For y=3f(2pheta-90')-1 , f(pheta)=sin pheta Evaluate for 30'
A: Is that y = 3f(2Θ-90°)-1? By the way, Θ is alt-233 (numbers on the right) and ° is ...
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| 8th Grade Math word prblem | 11/4/2009 | Scott A Wilson |
Q: Need help with how to set up following equation. Fred begins walking towards John's house at ...
A: It would be the same as if we asked how long it would take on to get across if they walked at (3+2) ...
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| Linear programming word problem | 11/3/2009 | Scott A Wilson |
Q: Matt is trying to determine the correct amount of fertilizer that should be applied to his lawn. A ...
A: I have put the answer in the attachment. Note that I put a +1 and a -1 where the rows have to have ...
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| Math | 11/3/2009 | Scott A Wilson |
Q: A principal of $2100 was invested in the stock market. Some shares of World Oil were bought at ...
A: Let the shares of World Oil be W. Let the shares of Zinco Mines be Z. What we are given is that ...
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| story problem | 11/3/2009 | Scott A Wilson |
Q: *etra bought gasoline when the odometer read 15,345.4 After the next filling, the odometer read ...
A: To get the number of miles that she drove take the ending value on the odometer - start value on ...
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| fraction story problem please help | 11/3/2009 | Scott A Wilson |
Q: 1. A recipe for strawberry punch calls for 1/5(qt) of ginger ale and 3/5(qt) of strawberry soda. a) ...
A: a) Well, it calls for one fifth of a quart and three fifths of a quart. Since the fractions are 1/5 ...
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| Ask You somethg. | 11/2/2009 | Scott A Wilson |
Q: one thing that always come to my mind and still its not being answered yet. To what extend truth in ...
A: With basic math, no. In graduate math, there might be one, though I can't recall studying sanything ...
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| Trig | 11/1/2009 | Scott A Wilson |
Q: I need help with this problem, please: Two hikers leave a tent at a campground and go separate ...
A: Put the campground at the origin on an x-y graph. This would put one town at (-15,0) and the other ...
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| Fractions | 11/1/2009 | Scott A Wilson |
Q: I sent you this question recently, and I have a follow-up question that follows your answer to my ...
A: I assume second Mary is supposed to be a different person. After all, the first one is 10 and the ...
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| Trig | 11/1/2009 | Scott A Wilson |
Q: I need help with this word problem, please: A building contractor is planning to use a ladder to ...
A: The ladder is the hypoteneuse of a right triangle. The ground is the horizontal edge and the ...
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| Fractions | 11/1/2009 | Scott A Wilson |
Q: I sent you this question recently, and I have a follow-up question that follows your answer to my ...
A: If Mary is M and Ruth is R, is this to say that M/2 + 2R/5 + M/4 = 14? That would say that 3M/4 + ...
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| Algebra i | 10/30/2009 | Scott A Wilson |
Q: grace dilutes 4.8 fl. oz. of pure hydrogen peroxide with 27.2 floz. of water to make 32 fl oz of a ...
A: What would happen if we added 1 oz of hydrogen peroxide, in theory only: 4.8 oz hydrogen peroxide ...
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| Uniform Motion Problem | 10/30/2009 | Scott A Wilson |
Q: A passenger train leaves a train depot 2 h after a freight train leaves the same depot. The freight ...
A: Time for P is time for F + 2. Both meet after 3 hours. Speed of F is speed of P - 20. This says ...
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| Fractions | 10/29/2009 | Scott A Wilson |
Q: 2/3 of Mary’s age equals Sarah’s age and 3/4 of Ruth’s age equals Sarah’s age. If the total ages ...
A: 2M/3 = R, 3R/4 = S, so putting R in gives 3(2M/3)/4 = S, so M/2 = S, so M = 2S. Also, it can be seen ...
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| Uniform Motion Problem | 10/29/2009 | Scott A Wilson |
Q: a car and a bus set out at 2 p.m. from the same point headed in the same direction. The average ...
A: Let C = car spped and B = bus speed. It is known that C+30=2B. Distance in 2 hours is 2C and 2B. It ...
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| systems of equations | 10/28/2009 | Scott A Wilson |
Q: a collection of nickels and dimes is $3.30. there are 42 coins in all. how many of each kid of coin ...
A: If they were all dimes, that would be $4.20. For each nickel added and dime subtracted, that makes ...
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| Speed, time & distance | 10/28/2009 | Scott A Wilson |
Q: Two cars left points A and B simultaneously, traveling towards each other. 9 hours after their ...
A: One of the basic physice equation is d = rt, where d=distance, r=rate, and t=time. I will try to ...
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| Algebra i | 10/28/2009 | Scott A Wilson |
Q: Grace dilutes 4.8 fluid oz. of pure hydrogen peroxide with 27.2 fluid oz. of water to make 32 fluid ...
A: Currently, we have 4.8/32 = 24/160 = 3/20 = 15/100 = 15% as the concentration of hydrogen peroxide. ...
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| math word problem | 10/28/2009 | Scott A Wilson |
Q: many of my teachers disagree with the answer some say -10 some say-16 What do you think? Rachel ...
A: R and L are swimmers. When L has 2 laps, R has 4 laps. Since they swim at the same rate, this means ...
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| Math word problems | 10/27/2009 | Scott A Wilson |
Q: I need help doing these two problems. I have a software of SAT Prep and it gave me these two ...
A: The distance from A to B is x. At 40 mph, this takes x/40 hours to drive. At 60 mph, this takes x/60 ...
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| Advanced algebra | 10/26/2009 | Scott A Wilson |
Q: A math teacher has a ream of 500 sheets of graph paper. Each week the advanced algebra class uses 90 ...
A: a. There are 90 used per week, so that is -90w. They start with 500, so the number of sheet left is ...
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| Question about figuring inflation | 10/26/2009 | Scott A Wilson |
Q: The equation S=C(1+r/100)^5 is to find the inflated cost S, in five years of an item, where C is the ...
A: If the inflation rate is -0.3%, that means that next year the product will only be worth 99.7% of ...
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| Problem about two lottery winners | 10/26/2009 | Scott A Wilson |
Q: Two winners of lottery tickets had a payoff of $3.65 million. If they receie monthly payments over ...
A: There is $3.65 million, which is 3,650,000. Divide by 20 to get the amount per year. Now 3.65/2 = ...
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| Quadratic Function Story Problem | 10/26/2009 | Scott A Wilson |
Q: Big Bertha, a cannon used in World War I, could fire shells incredibly long distances. The path of a ...
A: To find out how far, solve for y = 0. The equation factors into x(-0.0196x + 1.27). The 1st ...
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| math | 10/23/2009 | Scott A Wilson |
Q: plane flying at 500 miles per hour leaves chicago. 1/2 hour later, second plane leaves flying in the ...
A: Since only half an hour has passed, the one flying at 500 mph is only 500/2 = 250 miles ahead. ...
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| Probability Word problem | 10/22/2009 | Scott A Wilson |
Q: If you can help with this problem also, it would be greatly appreciated. I have been banging my head ...
A: Let G=goalie, B=back, M=midfielder, and F=forward. The soccer team has 16 members. Now to go ...
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| Algebra i | 10/22/2009 | Scott A Wilson |
Q: An alloy containing 30% gold is mixed with a 60% gold alloy to get 300 kilograms of an alloy that is ...
A: If N kilograms of alloy 1 were used, then 300-N kilograms of ally 2 were used. Using this, there ...
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| algebra 1-b | 10/22/2009 | Scott A Wilson |
Q: Sally wants to buy some accessories for her hair. She can buy two scrunchies and four barrettes for ...
A: Let S be the scrunchies and B be the batteries. We are given that 2S + 4B = $12.50 and that S + 6B ...
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| word problem | 10/21/2009 | Scott A Wilson |
Q: please bear with me, i' a slow typist M is 8 more than a second number. which of the following ...
A: B, since M is 8 more, the second number is M-8. 1) If you had 5 and you had one more than your ...
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| welding/math | 10/20/2009 | Scott A Wilson |
Q: A tensile test was performed on a 0.505 inch diameter standard tensile bar machined from a weld ...
A: If the diameter of the bar was d = 0.505, the radius is r = 0.505/2 = .2525. This makes the area = ...
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| Math Word problem | 10/19/2009 | Scott A Wilson |
Q: Help please. Problem = A five digit number with 5 different digits. Place a 2 in front of number to ...
A: I thought about how to do this, and then decided to let the computer figure it out. I wrote a quick ...
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