# Questions on Word Problems: Evaluation, Substitution answered by real tutors!

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 Word Problems: Evaluation, Substitution Solvers Lessons Answers archive Quiz In Depth

 Question 465335: determine if given number is a solution is the given equation 52; x/8=6 Click here to see answer by rfer(12670)

 Question 465438: For borrowers with good credit scores, the mean debt for revolving and installment accounts is \$15,015 (BusinessWeek, March 20, 2006). Assume the standard deviation is \$3,380 and that debt amounts are normally distributed. What is the probability that the debt for a randomly selected borrower with good credit is more than \$18,000 (to 4 decimals)? What is the probability that the debt for a randomly selected borrower with good credit is less than \$10,000 (to 4 decimals)? What is the probability that the debt for a randomly selected borrower with good credit is between \$12,000 and \$18,000 (to 4 decimals)? What is the probability that the debt for a randomly selected borrower with good credit is no more than \$14,000 (to 4 decimals)? Click here to see answer by edjones(7569)

 Question 465513: For borrowers with good credit scores, the mean debt for revolving and installment accounts is \$15,015 (BusinessWeek, March 20, 2006). Assume the standard deviation is \$3,650 and that debt amounts are normally distributed. What is the probability that the debt for a randomly selected borrower with good credit is more than \$18,000 (to 4 decimals)? What is the probability that the debt for a randomly selected borrower with good credit is less than \$10,000 (to 4 decimals)? What is the probability that the debt for a randomly selected borrower with good credit is between \$12,000 and \$18,000 (to 4 decimals)? What is the probability that the debt for a randomly selected borrower with good credit is no more than \$14,000 (to 4 decimals)? Click here to see answer by edjones(7569)

 Question 465598: Ninety percent of the population in Woodville has carpet in their home. A marketer of carpet cleaner learned that, last year, 10% of the population with carpet purchased Foamy carpet cleaner. He also knows that 9.5% of the total population purchased it. What percentage of the population without carpet in their home purchased Foamy last year? Click here to see answer by ewatrrr(10682)

 Question 465635: what is the smallest number that increases its value by 12 when the numbers order of the digits is reversed? Click here to see answer by richard1234(5390)

 Question 465735: Solve using the elimination method. Show your work. If the system has no solution or an infinite number of solutions, state this. Please show all work! -6x – 6y = -12 -6x + 7y = 14 Click here to see answer by ewatrrr(10682)

 Question 465738: Solve using the elimination method. Show your work. If the system has no solution or an infinite number of solutions, state this. -5x + 4y = -16 -15x + 2y = -58 Click here to see answer by ewatrrr(10682)

 Question 465782: A stock decreases in value by 20 percent. By whay percent must the stock reach its former value. A. 15% B.20% C. 25% D. 40% Click here to see answer by edjones(7569)

 Question 465976: my plant was x cm high it has grown 10% what is the new height new height is known to be 35.2cm what is x? Click here to see answer by sofiyac(695)

 Question 466039: If y^4 is multiplied by y^3, what would the exponent value of y become? Click here to see answer by katealdridge(100)

 Question 465967: I sm 10% older than my wife. My wife is x% younger than I am. find x. Click here to see answer by Alan3354(30993)

 Question 466052: Tracy's dog eats 8 ounces of dog food every day. How many pounds of dog food will her dog eat in 40 days? So my math teacher said 320 pounds but i know that 16 ounces equal a pound and my teacher said that if the dog eats 8 ounces everday then in 40 days he will eat 40 times the amount the dog eats every day (this is true) but once my teacher did 8 times 40 he got 320 ounces and in the answer space wrote 320 pounds. I was wondering why he never converted the 320 ounces to pounds which would be 320/16 (i think) please help... :) Click here to see answer by solver91311(16897)

 Question 466212: Many drugs used to treat cancer are expensive. BusinessWeek reported on the cost per treatment of Herceptin, a drug used to treat breast cancer (BusinessWeek, January 30, 2006). Typical treatment costs (in dollars) for Herceptin are provided by a simple random sample of 10 patients. 4,357 5,564 2,698 4,906 4,482 4,804 6,449 4,108 4,229 3,809 Develop a point estimate of the standard deviation of the cost per treatment with Herceptin (to 1 decimal). Click here to see answer by Ryan O'Hara(46)

 Question 466213: If a taxicab driver charges \$0.60 for the first 1/3 mile and \$0.40 for each 2/5 mile, or part thereof, after that, a ride costing \$3.80 could be at most how many miles long? My problem intrinsically is how to tackle questions like these. If you would also show me a common methodology that would solve most, if not all of these types of problems, I will be eternally grateful. Thank you. Click here to see answer by Ryan O'Hara(46)

 Question 466211: The Democrat and Chronicle reported that 25% of the flights arriving at the San Diego airport during the first five months of 2001 were late (Democrat and Chronicle, July 23, 2001). Assume the population proportion is p = .25. Calculate () with a sample size of 800 flights (to 4 decimals). What is the probability that the sample proportion will be within +/- .03 of the population proportion if a sample of size 800 is selected (to 4 decimals)? What is the probability that the sample proportion will be within +/- .03 of the population proportion if a sample of size 400 is selected (to 4 decimals)? Click here to see answer by Ryan O'Hara(46)

 Question 466267: Polygons ABCD and AFGE are similar. AD = 12 and AE = 6. If AF = 7 what is the length of AB? http://4.bp.blogspot.com/-ZrLpKpV4BZE/Tg0VwfZz1PI/AAAAAAAAAAM/cE0AV9wqtG8/s320/IMG_20110630_145004.jpg There is a picture of my problem. Thank you! -Dimitri Click here to see answer by Love math(28)

 Question 465555: Please help me solve this question : The total of marks of all students in one class is 2795 and average is 65. How many student are in that class ? Click here to see answer by richard1234(5390)

 Question 466357: Write an equation for the line perpendicular to y = 2x - 5 that contains (-9,6). a) y-6=2(x+9) b) x-6=2(y+9) c) y-9=1/2(+6) d) y-6=1/2(x+9) Click here to see answer by stanbon(57387)

 Question 466434: help with this problem would be much appreciated! solve the following system of equations. x + 6y = 4 x = 3 - 6y Click here to see answer by jorel1380(2518)

 Question 466436: i really would appreciate some help with this problem. trains A and B are traveling in the same direction on parallel tracks. train A is traveling at 40 mph and train B is traveling at 50 mph. train A passes a station at 2:25 a.m. if train B passes the same station at 2:37 a.m.,at what time will train B catch up to train A? Click here to see answer by mananth(12270)
 Question 466436: i really would appreciate some help with this problem. trains A and B are traveling in the same direction on parallel tracks. train A is traveling at 40 mph and train B is traveling at 50 mph. train A passes a station at 2:25 a.m. if train B passes the same station at 2:37 a.m.,at what time will train B catch up to train A? Click here to see answer by ccs2011(207)

 Question 466438: solve using the multiplication principle. don't forget to perform a check. -1/2x = -3/4 could someone help me with this please? Click here to see answer by jorel1380(2518)

 Question 466439: any help with this would be great. find the domain of the function. g(x) = 5/2-9x Click here to see answer by Scorinitron(19)
 Question 466439: any help with this would be great. find the domain of the function. g(x) = 5/2-9x Click here to see answer by tinbar(128)

 Question 466528: Hi there!:) I would like to ask some help with my word problem solving...If one could please help me with it.. The problem is: The measure of an angle and its complement differ by 22. Find the angle and its complement. I would like to thank the one who would help me in advance!:D Click here to see answer by Theo(3464)

 Question 466534: Good day!:) I would like to ask some help regarding this word problem...If someone could help me ASAP... Here's the problem: The measure of an angle and its complement differ by 22. Find the angle and its complement. Thank you in advance!:) Click here to see answer by stanbon(57387)

 Question 466527: Good day!:) I would like to ask for some help regarding my math homework..It is about Word Problems.. Here's the problem: Find two rational numbers such that the second number if five more than three times the first number. The sum of numbers is 19. Can someone please help me?:D Thank you so much for your help in advance!:) Click here to see answer by Earlsdon(6287)

 Question 466613: A cook uses 1/3 pound of hamburger to make the lunch special. How many specials can he make from 15 pounds of hamburger? Click here to see answer by Gogonati(809)

 Question 466607: A stack of books is 24 inches high. Each book in the stack is ¾ inch thick. How many books are in the stack? Click here to see answer by Gogonati(809)

 Question 466608: Carina works part- time at a toy store as a bike assembler. She can build a bicycle in 2½ hours. If she works 25 hours in a week, how many bicycles can she assemble? Click here to see answer by Gogonati(809)

 Question 466432: i seriously need some help with this problem! in 1993, the life expectancy of males in a certain country was 66.8 years. in 2000, it was 70.4 years. let E represent the life expectancy in year t and let t represent the number of years since 1993. the linear function that fits the data is E(t) = ?t + ? use the function to predict the life expectancy of males in 2003. E(10) = ? Click here to see answer by ankor@dixie-net.com(15660)

 Question 466657: Here is my problem: Imagine you are in the market for a new home and are interested in a new housing community under construction in a different city. The sales representative informs you that there are 56 houses for sale with two floor plans still available. Use x to represent floor plan one and y to represent floor plan two. Write an equation that illustrates the situation. This is what I come up with: x=56/2 y=56/2 But it doesn't look right to me. Thank you in advance for your help. Click here to see answer by stanbon(57387)

 Question 466612: You have 10 cups of sugar. Your cookie recipe calls for 1¼ of sugar for one batch. What is the greatest number of batches of cookies you could make with the sugar that you have? Click here to see answer by rfer(12670)

 Question 466755: Solve using the substitution method. Show your work. If the system has no solution or an infinite number of solutions, state this.-8x – 4y = -68x + 3y = 16 i have forgotten how this was done. can you help? Click here to see answer by Alan3354(30993)

 Question 466635: If Robert has a pack of matches that has 35 packs, and each pack has 113 matches. If he gives 13 packs away and 355 matches to his friends. How many matches does he had at first, and how many did he had left after giving some to his friends? Click here to see answer by rrr2001(7)

 Question 466743: Please help me on this one. I get confused with Word Problems!!! Please help me :) Thanks so much!!! J.Bond and E.Blofeld are driving speedboats in opposite directions after a failed attempt by the latter to blow up the world with a nuclear bomb. Mr.Bonds boat is going 25 MPH faster than Mr.Blofelds. After 3 hours they are 500 miles apart. How fast was each of them going? Click here to see answer by rfer(12670)

 Question 466773: Solve using the substitution method. Show your work. If the system has no solution or an infinite number of solutions, state this. Please show all your work. -7x + 7y = -7 x + 9y = 61 Click here to see answer by rfer(12670)

 Question 466772: A dehydrated patient needs a 3.24% saline IV. Unfortunately, the hospital only has bags of 1% and 9% saline solutions. How many liters of each of these solutions should be mixed together to yield 5 liters of the desired concentration? Please show all your work. Click here to see answer by Theo(3464)