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# Recent problems solved by 'rfer'

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 Numbers_Word_Problems/257861: The perimeter of a rectangular garden is 58 meters. Its length is 5 meters more than its width. Find the length and width of the garden. The width of a flat screen is 4 times more than its height. If the perimeter of the flat screen is 120 cm, find the width and height of the screen.1 solutions Answer 189766 by rfer(12660)   on 2010-01-17 23:54:19 (Show Source): You can put this solution on YOUR website!2x+2(x+5)=58 2x+2x+10=58 4x=48 x=12 m x+5=17 m ------------- 2x+2(4x)=120 2x+8x=120 10x=120 x=12 cm 4x=48 cm
 Travel_Word_Problems/257887: if i am travelling 20 km per hour, how far do i travel in ten seconds1 solutions Answer 189764 by rfer(12660)   on 2010-01-17 23:49:41 (Show Source): You can put this solution on YOUR website!20/360=x/10 200/360=0.56 km
 Rectangles/257841: 2. Suppose that the length of a rectangle is three cm longer than twice the width and that the perimeter of the rectangle is 90 cm. a) Set up an equation for the perimeter involving only W, the width of the rectangle. Answer: b) Solve this equation algebraically to find the length of the rectangle. Find the width as well. Answer: Length ______, Width ______ Show your work here: 1 solutions Answer 189745 by rfer(12660)   on 2010-01-17 21:04:10 (Show Source): You can put this solution on YOUR website!p=2w+2(2w+3) 90=2w+4w+6 90=6w+6 84=6w 14=w w=14 cm 2w+3=31 cm
 Surface-area/257780: If the top of a coke can has a 7 cm diameter, what is the radius, circumfrence and area? 1 solutions Answer 189742 by rfer(12660)   on 2010-01-17 20:59:03 (Show Source): You can put this solution on YOUR website!r=.5d r=3.5 cm ----------- c=pi*d c=7*3.1416 c=22 cm -------------- a=pi*r^2 a=3.14*3.5^2 a=3.14*12.25 a=38.47 sq cm
 Money_Word_Problems/257814: A certificate of deposit for one year pays \$221 simple interest on a principal of \$3400. What is the interest rate being paid on this deposit?1 solutions Answer 189739 by rfer(12660)   on 2010-01-17 20:54:05 (Show Source): You can put this solution on YOUR website!i=Prt r=i/Pt r=221/3400*1 r=0.065 = 6.5%
 Mixture_Word_Problems/257827: Two trains leave a train station at the same time. One travels east at 11 miles per hour. The other train travels west at 7 miles per hour. In how many hours will the two trains be 118.8 miles apart?1 solutions Answer 189737 by rfer(12660)   on 2010-01-17 20:51:32 (Show Source): You can put this solution on YOUR website!moving apart at 18 mph 118.8/18=6.6 hrs or 6 hrs 36 min
 Rectangles/257835: the perimeter of a rectangle is 136 inches. the length exceeds the width by 22 inches. find the length and the width?1 solutions Answer 189736 by rfer(12660)   on 2010-01-17 20:48:24 (Show Source): You can put this solution on YOUR website!2x+2(x+22)=136 2x+2x+44=136 4x=92 x=23 in x+22=45 in
 Matrices-and-determiminant/257777: Write an equation for the line. Use slope-intercept form, if possible. Through (0, 2) m=1/2 1 solutions Answer 189659 by rfer(12660)   on 2010-01-17 17:04:04 (Show Source): You can put this solution on YOUR website!y=mx+b y=1/2x+2
 Matrices-and-determiminant/257778: Find the slope of the line. y=5/3x1 solutions Answer 189656 by rfer(12660)   on 2010-01-17 17:02:43 (Show Source): You can put this solution on YOUR website!the slope is 5/3
 Probability-and-statistics/257774: Consider the experiment of selecting a card from an ordinary deck of 52 playing cards and determine the probability of a red 7 is drawn1 solutions Answer 189655 by rfer(12660)   on 2010-01-17 17:02:00 (Show Source): You can put this solution on YOUR website!2/52=1/26
 Numeric_Fractions/257771: how do you slove r+1/3=8/31 solutions Answer 189654 by rfer(12660)   on 2010-01-17 17:00:48 (Show Source): You can put this solution on YOUR website!r+1/3=8/3 r=8/3-1/3 r=7/3 or 2 1/3
 Human-and-algebraic-language/257592: The final grade for a particular course is calculated by dividing total points earned by total points available. There are 120 points available in the first half of the course, and 140 points in the second half of the course. If a student earns 81% in the first half of the course, how many points must the student earn in the second half in order to earn an 80% B final grade?1 solutions Answer 189651 by rfer(12660)   on 2010-01-17 16:59:15 (Show Source): You can put this solution on YOUR website!total points=260 260*.8=208 must earn 208 total points 120*.81=97 points earned in first part. 208-97=111 points on second half
 percentage/257590: they only give me 1,114,00 and say that its only 1 percent of the whole, and they ask if its 1 percent then how much of that percent would 10,000 be?1 solutions Answer 189644 by rfer(12660)   on 2010-01-17 16:53:09 (Show Source): You can put this solution on YOUR website!10000/1114000=.000897=.0897% of 1114000 I believe the way the problem is worded, the new whole becomes 1114000 for this calculation
 Travel_Word_Problems/257761: A train travels at 120 km/h. estimate the distance it can travel in 7h 45min. 1 solutions Answer 189640 by rfer(12660)   on 2010-01-17 16:44:50 (Show Source): You can put this solution on YOUR website!900km
 Travel_Word_Problems/257762: A train travels at 120 km/h. estimate the distance it can travel in 7h 45min. 1 solutions Answer 189639 by rfer(12660)   on 2010-01-17 16:44:23 (Show Source): You can put this solution on YOUR website!900km
 Money_Word_Problems/257673: Compute the compounded quarterly interest earned over 2 years time on 200.00 deposited into an acount earning 4 percent annually1 solutions Answer 189637 by rfer(12660)   on 2010-01-17 16:42:25 (Show Source): You can put this solution on YOUR website!A=200(1+.04/4)^4*2 A=200(1.01)^8 A=200*1.0828567 A=216.57 interest earned= \$16.57
 Money_Word_Problems/257754: You want to have a \$90,000 college fund in 11 years. How much will you have to deposit now under the scenario below. Assume that you make no deposits into the account after the initial deposit. An APR of 5% compounded daily.1 solutions Answer 189635 by rfer(12660)   on 2010-01-17 16:35:12 (Show Source): You can put this solution on YOUR website!P=A/(1+r/n)^nt P=90000/(1+.000136986)^4015 P=90000/1.7331856 P=\$51,927.50
 Travel_Word_Problems/257757: A train travels at 120 km/h. estimate the distance it can travel in 7h 45min. 1 solutions Answer 189633 by rfer(12660)   on 2010-01-17 16:28:09 (Show Source): You can put this solution on YOUR website!120*7.75=930 km
 Expressions-with-variables/257676: what is a algebraic expression 1 solutions Answer 189632 by rfer(12660)   on 2010-01-17 16:26:32 (Show Source): You can put this solution on YOUR website!something with no equal sign in it
 Angles/257682: 5x+2y+2x-4x1 solutions Answer 189630 by rfer(12660)   on 2010-01-17 16:23:45 (Show Source): You can put this solution on YOUR website!3x+2y
 Money_Word_Problems/257689: You deposit \$25,000 in an account to accrue interest for 40 years. the account pays 4% compunded anually. Assume that the income tax on the earned interest is 30%. Which of the following plans produces a larger balance after all income tax is paid? (A) the income tax on the interest that is earned is paid in one lump sum at the end of 40 years. or (B)The income tax on the interest that is earned each year is paid at the end of each year. i know i am supposed to use the A=P(1+r/n)^nt equation, but im not sure where to put the information. please help. thank you.1 solutions Answer 189629 by rfer(12660)   on 2010-01-17 16:21:15 (Show Source): You can put this solution on YOUR website!A= future value P=present value r=interest rate n= number of compounding periods per year t=number of years Does that help?
 Geometry_Word_Problems/257691: a rectangle is 3 times as long as it is wide. the premiter is 60 cm. Find the length of the rectangle1 solutions Answer 189627 by rfer(12660)   on 2010-01-17 16:17:52 (Show Source): You can put this solution on YOUR website!2x+2(3x)=60 2x+6x=60 8x=60 x=7.5 cm 3x=22.5 cm
 percentage/257698: A retail store has items such that they fall under the categories of clothes, housewares, jewelry, and other. . If the floor space allocated to housewares is 24,450 square feet with a 32.6%.What space is allocated to jewlery with a 18.4%. 1 solutions Answer 189624 by rfer(12660)   on 2010-01-17 16:14:51 (Show Source): You can put this solution on YOUR website!24450/.326=75000 total space 75000(.184)=13800 sq ft to jewelry
 Linear-equations/257740: How do I find the slope and y-intercept of: -3x + y= -21 solutions Answer 189621 by rfer(12660)   on 2010-01-17 16:10:01 (Show Source): You can put this solution on YOUR website!-3x+y=-2 change to y=mx+b form y=3x-2 m=slope=3/1 y int=(0,-2)
 Money_Word_Problems/257741: suppose u start saving today for a \$45000 down payment that you plan to make on a house in 5 years. Assume that you make no deposits into the account after the initial deposit. For the account described below, how much would you have to deposit now to reach for \$45000 goal in 5 years. an account with daily compounding and an APR of 4% 1 solutions Answer 189619 by rfer(12660)   on 2010-01-17 16:08:06 (Show Source): You can put this solution on YOUR website!P=A/(1+r/n)^nt P=45000/(1+.04/365)^365*5 P=45000/(1.0001)^1825 P=45000/1.2 P=\$37,500
 Linear-equations/257743: how do i graph the slope and y intercept of X+5y=101 solutions Answer 189617 by rfer(12660)   on 2010-01-17 16:02:51 (Show Source): You can put this solution on YOUR website!x+5y=10 Change to y int form y=mx+b 5y=-x+10 y=-x/5+2 (-1/5,2) y int =(0,2) m=slope=-1/5
 Polygons/257571: I've done pretty good with ratios and proportions until I hit this one and I'm stumped. The question reads: A baseball players batting average is the ratio of number of hits to number of times at bat. A player has 10 hits out of 20 times at bat. How many consecutive times at bat must a hit be made to raise his average to .600? I'm guessing that somehow I have to use his current average of .500 but I can't figure out how to set up the equation to get the .600. Thanks for any help, Laura1 solutions Answer 189481 by rfer(12660)   on 2010-01-16 20:51:10 (Show Source):
 Inequalities/257390: Can you please help me solve u/8=7/17 and rounnd it to the nearest tenth? Thank you!!1 solutions Answer 189479 by rfer(12660)   on 2010-01-16 20:44:58 (Show Source): You can put this solution on YOUR website!u/8=7/17 17u=7*8 17u=56 u=3.3
 Finance/257407: a person will receive rs.5000six years from now.what is its present value at a compounded discount rate of 8%.1 solutions Answer 189476 by rfer(12660)   on 2010-01-16 20:41:18 (Show Source): You can put this solution on YOUR website!p=5000/(1+.08)^5 p=5000/1.469328 p=\$3403
 Money_Word_Problems/257500: Ralph Chase plans to sell a piece of property for \$180,000. He wants the money to be paid off in two ways, a short-term note at 11% interest and a long-term note at 8% interest. Find the amount of each note if the total annual interest paid is \$17,400.1 solutions Answer 189474 by rfer(12660)   on 2010-01-16 20:29:55 (Show Source): You can put this solution on YOUR website!.11x+.08(180000-x)=17400 .11x+14400-.08x=17400 .03x=3000 x=\$100,000 at 11% \$80,000 at 8%
 Exponents-negative-and-fractional/257568: I do not understand how to solve this problem :-12=5r+8. No matter how I try, I don't understand the concept. Can you help? muchie367@yahoo.com1 solutions Answer 189472 by rfer(12660)   on 2010-01-16 20:22:44 (Show Source): You can put this solution on YOUR website!-12=5r+8 take -8 from both sides -20=5r divide both sides by 5 -4=r