| Subject | Date Asked | Expert |
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| linear- perpendicular lines | 7/9/2009 | Abe Mantell |
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 ...
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| Linear equation | 7/8/2009 | Josh |
Q: Below problem has given me to solve as assignment from my university. Department A B C I ...
A: Your question is of the form Maximize C=c1+c2+c3 where c1=20x+30y+40z, c2=20u+30v+40w, ...
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| HELP! | 7/8/2009 | Lynn Houston |
Q: Problem #1 Donna invested her $33,000 bonus and received a total of $970 in interest after one year. ...
A: x=amt invested at 4% y=amt invested at 2.25% x+y= 33000 (x=33000-y) .04x + .0225y = 970 ...
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| grade 11 math | 7/7/2009 | Lynn Houston |
Q: a uniform-width boardwalk is built around the inside edge of a rectangular parkland that is 10 m by ...
A: 63cm the rectangle is 1000x1500cm for a total of 1,500,000cm^2. 20% of 1,500,000cm is 300,000, so ...
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| fuel efficiency | 7/7/2009 | Josh |
Q: Fuel Efficiency. Last week, Joe’s Electric Service used 110 gallons of gasoline in its two trucks. ...
A: The fuel used by each truck is given by D(distance driven) times E(efficiency). Let D be the ...
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| equation | 7/7/2009 | Abe Mantell |
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 ...
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| work problem | 7/6/2009 | Abe Mantell |
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, ...
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| Algebra 2 | 7/5/2009 | Josh |
Q: Give the domain of the linear equation: y= x + 2 _____ x
A: Brandon, The domain is the set of values that x can take without causing the function to "explode". ...
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| Math - rounding a decimal number | 7/1/2009 | John Zalewski |
Q: could you please round the decimal number .012146 to the nearest hundred thousandth ? Thanks
A: David. The hundred-thousandth place is the fifth spot to the right of the decimal point. For your ...
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| 'y' math problem | 6/25/2009 | Lynn Houston |
Q: my fourth grade grandchild is doing math problem with finding the 'y' problem. I understand on ...
A: Not that I know of. It's still a matter of finding the lowest common denominator. I the example ...
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| co-ordinate geometry | 6/22/2009 | Josh |
Q: Find the equation of the line having intercept –3 and 7 on the co-ordinate axis a) 7x-3y+21=0 ...
A: Shruti, Giving you the right answer is not going to help you much if you do not explain what you ...
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| Time and speed | 6/22/2009 | Lynn Houston |
Q: Jane covered a distance of 340 miles between city A and city B, taking a total of 5 hours. If part ...
A: distance = time * speed Let y = distance traveled at 80mph and x=distance traveled at 60mph 340 = ...
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| Probability | 6/20/2009 | Josh |
Q: I have 3 questions I can't seem to work out. 1. 2 cards are simultaneously drawn from an ordinary ...
A: This answer suggests that it is NOT necessary to have at least one pair of each color. The main ...
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| Probability | 6/19/2009 | Josh |
Q: I have 3 questions I can't seem to work out. 1. 2 cards are simultaneously drawn from an ordinary ...
A: Given the limited space we have, I will start with the assumption that you are already quite ...
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| Finding all real solutions of the equation: | 6/18/2009 | Lynn Houston |
Q: 1/(x-1) + 1/(x+2) = 5/4
A: Start by multiplying each part by 4(x-1)(x+2), the denominator and part of the numerator will cancel ...
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| Order of Operation | 6/16/2009 | Josh |
Q: -6x-7(4+3x) Thanks, Josh!
A: Gita, As a general rule, always simplify any expression inside the parenthesis first if at all ...
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| ratio and proportion | 6/14/2009 | Josh |
Q: Last year Department store X had a sales total for December that was 4 times the average(arithmetic ...
A: Shruti, The sale for that year consists of two parts: 1) Let A represents sales total for January ...
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| Please Help with %s. | 6/14/2009 | Josh |
Q: I need to calculate this. There are two sections A and B. A is 150 points, B is 200 points. Both A ...
A: To calculate the worth of each A point as a percentage of the total, we need to look at only two ...
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| Mills | 6/13/2009 | Lynn Houston |
Q: Here is my question and solution. Can you reply indicating whether or not it is correct? Express ...
A: I believe your answer is correct. My process was this. I first figured out, what is one mill ...
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| percentages to fraction | 6/12/2009 | John Zalewski |
Q: i need to know how to change 112.5% to the lowest fraction
A: Cindy. The first step is to convert the 112.5% into a decimal. To do this, move the decimal point ...
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| word problem | 6/12/2009 | Josh |
Q: A model rocket is shot into the air and its path is approximated by h = -5t sqaured + 30t where h is ...
A: For 1), you need to find t when the rocket has zero elevation. i.e., you set h=0 in the equation and ...
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| sets | 6/10/2009 | Lynn Houston |
Q: In a certain examination 35 percent of the students failed in Mathematics and 20 percent failed in ...
A: I might be missing something, but if 10% failed in both (ie 90% passed both) and there are 110 that ...
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| sets | 6/10/2009 | Josh |
Q: In Company X, 30 percent of the employees live over ten miles from work and 60 percent of the ...
A: I had a quick look at the question, I think it goes like this. Let M denote the set of employees ...
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| maths | 6/9/2009 | Lynn Houston |
Q: how can i convert 0.383 to rational in which both the 3's are repeating but 8 doesn't repeat.
A: I'm not sure what you're asking because .383 *is* a rational number. If you want to turn it into a ...
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| n*0=0? | 6/9/2009 | John Zalewski |
Q: Is that true that n*0=0, where n is an integer? Now : 15*2=30 which means 30/15=2 and 30/2=15 ...
A: Joe. To my knowledge, division by 0 is still a very confusing concept, even for mathematicians. ...
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| Multiplied by zero | 6/9/2009 | Josh |
Q: My math teacher states that n*0 = 0, n=integer. So : 2*3=6 which means 6/3=2 15*3=45 which means ...
A: This is a good question because zero plays an important role in mathematics. It is true that any ...
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| Subtracting Decimals | 6/9/2009 | Abe Mantell |
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 ...
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| Subtracting Decimals | 6/9/2009 | John Zalewski |
Q: I am trying to figure how to solve decimals with nothing to borrow from. Ex... 0.0025 - 0.075, 0.9- ...
A: Taina. When subtracting decimals, you need to line up the decimal points. However, for your ...
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| sequences | 6/8/2009 | Josh |
Q: Please help. TheThe sum of the first three terms of a geometric sequence of positive integers is ...
A: Jackie, Re: a+b+c=7a ...[1] and a+b+c+d=45 ...[2], what you said is true. To go further, we need to ...
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| area | 6/3/2009 | Josh |
Q: the area of a regular octagon is 35 cm squared. What is the area of a similar octagon with sides sex ...
A: Amber, I will refer you to the diagram at ...
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| Variance Percent | 6/3/2009 | John Zalewski |
Q: What is the corrent way of calculating variance percentage ei: Forecast 1240 Actual 1357 Variance ...
A: Olivia. Variance Percentage = ((Actual-Forecast)/Forecast) x 100. For your example, you'd have ...
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| Statistics | 6/3/2009 | John Zalewski |
Q: Difination of median
A: Ammar. The 'median' is the middle number in a group of numbers. For example, suppose you had the ...
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| Stock Profit | 6/2/2009 | Josh |
Q: Not too long ago I asked the following question, and you replied with the answer that follows myAn ...
A: $55.44 vs $54.42. The differences are minor. I don't think we need to debate over this. The ...
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| help!!!!please | 6/2/2009 | John Zalewski |
Q: how to u change 42/16 into a mixed number. i am having a little trouble understanding the whole ...
A: Denise. First, divide 16 into 42. This gives you 2 with a remainder of 10. (2 x 16 = 32; 42 - 32 = ...
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| percentages | 6/2/2009 | Chanda Walker |
Q: I think I have a simple problem I just don't remember from my school days. I'm currently getting ...
A: x is your actual wage x * 0.7 = $3391 x = $4844.29 The number of hours in a week is ...
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| profit and loss | 5/29/2009 | Pawan Musale |
Q: Ken left a job paying $75,000 per year to accept a sales job paying $45,000 per year plus 15 percent ...
A: Shruti, First of I apologize for delayed response. My response is: Ken has a difference of $30,000 ...
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| Maths | 5/29/2009 | Lynn Houston |
Q: Find the smallest three digit number exactly divisible by 6,8 and 12.
A: 24. the easiest way to get the answer is to break down the numbers into their lowest multiples. 6 ...
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| profit and loss | 5/28/2009 | Lynn Houston |
Q: A certain used-book dealer sells paperback books at 3 times dealer's cost and hardbacks books at 4 ...
A: Let h = hardback books and p = paperback books h + p = 120 (3h-h)+ (4p-p) = 300 h=120-p 2(120-p) ...
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| profit and loss | 5/28/2009 | Feliz |
Q: An employee is paid a salary of $300 per month and earns a 6 percent commission on all her ...
A: Shruti, 300*12months + 6% of how much she has sold = 21,600 The 300 dollars is her base pay. When ...
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| Vectors | 5/27/2009 | Abe Mantell |
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. ...
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