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# Recent problems solved by 'rfer'

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 Money_Word_Problems/468729: Luke spends 12% of his weekly salary on dining out. Of the money spent dining out, 55% or \$39.60, is spent on fast food. What is Luke's weekly salary?1 solutions Answer 321593 by rfer(12657)   on 2011-07-09 19:26:26 (Show Source): You can put this solution on YOUR website!39.60/0.55=72 72/0.12=\$600
 Linear-equations/468663: Please help me with this algebra problem. If Barbara recieved a 4 percent raise and is now making \$41,200 per year. What was her salary before the raise? Round your answer to the nearest dollar.1 solutions Answer 321572 by rfer(12657)   on 2011-07-09 16:40:23 (Show Source): You can put this solution on YOUR website!41200/1.04=\$39,615.00
 Linear-equations/468670: Please help me with this algebra problem. Given the linear equation y=-3/2x+1 Find the y coordinates of the points (-4), (-2) and (6) Please show work.1 solutions Answer 321570 by rfer(12657)   on 2011-07-09 16:38:17 (Show Source): You can put this solution on YOUR website!y=-3/2*-4+1 y=-6+1 y=-5
 Equations/468653: i started with -3x+2x+1=4, and when -x-3=0 becomes x=-3 how does that happen? 1 solutions Answer 321565 by rfer(12657)   on 2011-07-09 15:25:07 (Show Source): You can put this solution on YOUR website!-3x+2x+1=4 -x+1-1=4-1 -x=3 -1*-x=3*-1 x=-3
 Linear-equations/468652: The line: y = 0.14x + 0.77 represents an estimate of the average cost of gasoline for each year. The line 0.11x - y = -0.85 estimates the price of gasoline in January of each year. Use the equations of the lines to determine if they are parallel. What did you find? Explain why you would expect the two lines to be intersecting, parallel, or perpendicular (chooseone)?1 solutions Answer 321564 by rfer(12657)   on 2011-07-09 15:04:08 (Show Source): You can put this solution on YOUR website!y=0.14x+0.77 y=0.11x+0.85 Different slope, no parallel or perpendicular but will intersect
 Linear-equations/468524: Please help me with this algebra problem. Thanks so much in advance. Simplify and show all work please 12 divided by 1/4 + 2/5 - 2^31 solutions Answer 321536 by rfer(12657)   on 2011-07-09 12:08:29 (Show Source): You can put this solution on YOUR website!12*4/1+2/5-8= 48+2/5-8= 40+2/5=40 2/5 200/5+2/5=202/5=40 2/5
 Functions/468600: Can you tell me the steps to solve: Find f(-3) when f(x)=|x-9| Thanks!1 solutions Answer 321535 by rfer(12657)   on 2011-07-09 12:01:25 (Show Source): You can put this solution on YOUR website!f(-3)=|-3-9| f(-3)=|12| absolute is value only
 Evaluation_Word_Problems/468572: A table is to be sold at P8,500.00. At what price should it be listed to allow a discount series of 15%, 8% and 3%?1 solutions Answer 321534 by rfer(12657)   on 2011-07-09 11:58:51 (Show Source): You can put this solution on YOUR website!8500*0.85=7225*0.92=6647*0.97=\$6447.59
 Evaluation_Word_Problems/468573: Company A offers to deliver an order of goods at a list price of P54,000.00 less 12%, 7% and 4% discounts. Company B offers to deliver similar goods at the same list price less 15%, 5% and 3% discounts. a. Which company has the better offer? b. How much would be saved by taking advantage of the better offer?1 solutions Answer 321531 by rfer(12657)   on 2011-07-09 11:50:07 (Show Source): You can put this solution on YOUR website!Co A 54000*0.88=47520*0.93=44193.60*42425.86 Co B 54000*0.85=45900*0.95=43605*0.97=42296.85 ---------------------- Co B best price. ---------------- 2nd part savings=129.01
 percentage/468551: in the examination,52% of the candidates failed in english,42% in mathematics.17% failed in both.find the % of those,who pass in both subjects1 solutions Answer 321530 by rfer(12657)   on 2011-07-09 11:43:33 (Show Source): You can put this solution on YOUR website!35% failed just english 25% failed just math =60% failed at least one. 40% passed both
 test/468580: Use the given conditions to write an equation for the lone in point-slope form slope=6/7, passing through (7,3)1 solutions Answer 321527 by rfer(12657)   on 2011-07-09 11:29:28 (Show Source): You can put this solution on YOUR website!y-3=6/7(x-7)
 Linear-equations/468586: Determine whether the given ordered pair is a solution of the system. (4, 5) x + y = 9 x - y = -11 solutions Answer 321523 by rfer(12657)   on 2011-07-09 11:20:54 (Show Source): You can put this solution on YOUR website!4+y=9 y=9-4 y=5 (4,5) ok -------------- 4-y=-1 -y=-5 y=5 (4,5) ok
 Exponential-and-logarithmic-functions/468588: Solve the exponential equation. Use a calculator to obtain a decimal approximation, correct to two decimal places, for the solution. 10x = 3.76 1 solutions Answer 321522 by rfer(12657)   on 2011-07-09 11:18:39 (Show Source): You can put this solution on YOUR website!10x=3.76 x=3.76/10 x=0.376 x=0.38
 Average/468463: solve grade average a student scores 75 and 91 on two differnt tests of 100 points. if the maximum score on the next test is also 100 points, what score does the student need to maintain an average of at least 80?1 solutions Answer 321479 by rfer(12657)   on 2011-07-08 23:56:19 (Show Source): You can put this solution on YOUR website!(75+91+x)/3=80 166+x=80*3 166+x=240 x=74
 Number-Line/468519: what is the answer using number line in this equation, (3x-2)=4?1 solutions Answer 321477 by rfer(12657)   on 2011-07-08 23:51:43 (Show Source): You can put this solution on YOUR website!3x-2=4 3x=6 x=2
 test/468520: What is 4 and 4/5 divided by 8/15? Can you show work please. Thank you!!1 solutions Answer 321476 by rfer(12657)   on 2011-07-08 23:50:32 (Show Source): You can put this solution on YOUR website!(4 4/5)/(8/15) 24/5*15/8=360/40=9
 Volume/468480: what is the volume of the cone with a diameter of 8 inches1 solutions Answer 321469 by rfer(12657)   on 2011-07-08 22:48:46 (Show Source): You can put this solution on YOUR website!not enough information
 Polynomials-and-rational-expressions/468499: add (13/10r)+(11/4r)1 solutions Answer 321468 by rfer(12657)   on 2011-07-08 22:47:09 (Show Source): You can put this solution on YOUR website!26/20r+55/20r=81/20r=4 1/20r
 Linear-equations/468497: Please help me with this question. Thanks in advance. An equation and two ordered pairs are given. Show each pair is a solution of the equation, then graph the two pairs to determine another solution. y = x - 2; (3,1),(- 2,- 4)1 solutions Answer 321466 by rfer(12657)   on 2011-07-08 22:45:19 (Show Source): You can put this solution on YOUR website!y=3-2 y=1 (3,1) ----------- y=-2-2 y=-4 (-2,-4)
 Miscellaneous_Word_Problems/468493: traffic signs are regulated by the manual on uniform traffic control devices. the perimeter of some traffic sign must be 88 inches. also, its length is 6 inches longer than its width. find the dimensions of this sign.1 solutions Answer 321465 by rfer(12657)   on 2011-07-08 22:42:23 (Show Source): You can put this solution on YOUR website!2x+2(x+6)=88 You do the math. Bob
 Rate-of-work-word-problems/468374: The sum of the Three Numbers is 55. The second number is twice the first number, and the third number is three more than one-third the sum of the first two numbers. What are the numbers?1 solutions Answer 321426 by rfer(12657)   on 2011-07-08 18:59:58 (Show Source): You can put this solution on YOUR website!x+2x+1/3(3x)+3=55 4x=52 x=13 2x=26 1/3(3x)+3=16
 Money_Word_Problems/468346: The amount of money that a salesperson makes varies directly as the total amount of sales made. If the salesperson receives \$7,500 for selling a house for \$120,000 how much will he or she make if he or she sells a house for \$150,000. So far my answer is 9,375 but I'm not sure I'm doing the work right.1 solutions Answer 321424 by rfer(12657)   on 2011-07-08 18:55:56 (Show Source): You can put this solution on YOUR website!7500/120000=0.0625=6.25% 150000*0.0625=\$9375 Looks good to me. Bob
 Volume/468433: Please Help! Solve the problem. Use = 3.14 when necessary. At \$3.40 per in3, how much will it cost to fill an aquarium with dimensions of 6 1/3 inch x 3 4/5 inch x 4 1/2 inch? A. \$613.70 B. \$261.63 C. \$368.22 D. \$310.94 The answer is C. What are the steps to figure this out. I converted each faction: 6 1/3= 19/3=190/30; 3 4/5= 19/5=114/30; 4 1/2= 9/2=135/30. Total: 439/30. I am confusing myself.1 solutions Answer 321421 by rfer(12657)   on 2011-07-08 18:50:14 (Show Source): You can put this solution on YOUR website!19/3*19/5*9/2=3249/30 cu in =108 3/10 cu in total 3249/30*3.40=\$368.22 Your working to hard, you need improper fractions to multiply, but no need for common denominators in multiplcaton. Also to find cubic measurments, multiply not add. V=L*W*H
 Travel_Word_Problems/468373: The speed of train A is 8mph slower than the speed of train B. Train A travels 230 miles in the same time it takes Train B to travel to 270 miles. find the speed of each1 solutions Answer 321417 by rfer(12657)   on 2011-07-08 18:42:14 (Show Source): You can put this solution on YOUR website!230/(x-8)=270/x 230x=270(x-8) 230x=270x-2160 -40x=-2160 x=54 mph x-8=46 mph
 Quadratic_Equations/468067: Identify the vertex and the y-intercept of the graph of each function for y = (x - 125)2 + 1251 solutions Answer 321247 by rfer(12657)   on 2011-07-07 20:49:47 (Show Source): You can put this solution on YOUR website!vertex and y int are the same point (0,15625)
 Inequalities/468179: the smiths have saved \$25,000 toward the purchase of a new car. if the sales tax if 5 % the purchase price of the smiths new car before taxes cannot exceed what ?1 solutions Answer 321244 by rfer(12657)   on 2011-07-07 20:39:00 (Show Source): You can put this solution on YOUR website!25000/1.05=\$23,809.52
 Coordinate-system/468174: graph: y=4x+80, y=1/2x+10 where do they intercept?1 solutions Answer 321241 by rfer(12657)   on 2011-07-07 20:37:23 (Show Source): You can put this solution on YOUR website!1/2x+10=4x+80 -3.5x=70 x=-20 ------------- y=4*-20+80 y=-80+80 y=0 ----------- intercept (-20,0) ---------------- 0=1/5*-20+10
 Inequalities/468176: a jewelry salesman can earn either a salary of 2,500 a month or a salary of 1,000 a month plus 10% of all sales .how much does he have to sell for the second choice to earn him more than the first choice ?1 solutions Answer 321237 by rfer(12657)   on 2011-07-07 20:30:43 (Show Source): You can put this solution on YOUR website!1500/0.1=\$15,000
 Functions/468159: Please I need hel dipalma uivesity has a faculity reduction and lost 1/14 of its faculityu If 286 of it faculity was left after the reduction how many was there orginally.1 solutions Answer 321231 by rfer(12657)   on 2011-07-07 20:00:09 (Show Source): You can put this solution on YOUR website!286/(13/14)= 286*14/13=308
 Evaluation_Word_Problems/468071: The pitch of a roof is the ratio of the rise to the half-span. If a roof has a rise of 6 feet and a span of 30 feet, what is the pitch? 1 solutions Answer 321213 by rfer(12657)   on 2011-07-07 18:46:07 (Show Source): You can put this solution on YOUR website!6/30=1/5 one ft rise in five ft run
 Systems-of-equations/468135: 2x+7-3x=-x+121 solutions Answer 321211 by rfer(12657)   on 2011-07-07 18:42:15 (Show Source): You can put this solution on YOUR website!-x+x=5 no solution