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# Recent problems solved by 'rfer'

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 Expressions-with-variables/457098: After being discounted 45%, a radio sells for \$49.20. Find the original price. 1 solutions Answer 313639 by rfer(12662)   on 2011-06-03 13:39:16 (Show Source): You can put this solution on YOUR website!49.20/0.55=\$89.45
 Age_Word_Problems/457094: If I have 3 years and my brother is 3 years older than me. How old is my brother?1 solutions Answer 313638 by rfer(12662)   on 2011-06-03 13:37:58 (Show Source): You can put this solution on YOUR website!6 yrs
 Expressions-with-variables/457099: Some bank robbers leave town, speeding at 71 mph. Twelve minutes later, the police give chase, traveling at 80 mph. How long will it take after the robbery for the police to overtake the robbers?1 solutions Answer 313637 by rfer(12662)   on 2011-06-03 13:37:16 (Show Source): You can put this solution on YOUR website!14.2 mi lead overtake speed=9mph 14.2/9=1.6 hrs =1 hr 36 min
 Linear-equations/457100: What is the slope of the line between (-4, 4) and (-1, -2)1 solutions Answer 313635 by rfer(12662)   on 2011-06-03 13:34:48 (Show Source): You can put this solution on YOUR website!slope m=(-2-4)/(-1--4) m=-6/3 m=-2
 Evaluation_Word_Problems/457078: i need help solving this problem: (3-4((-2)+h)^2)-(3-4((-2)^2)/h the answer is (16h-4h^2)/(h) my question is how did they get to the answer? If you could please show me a step by step instruction on how to solve this problem i would greatly appreciate it. thank you. 1 solutions Answer 313634 by rfer(12662)   on 2011-06-03 13:33:11 (Show Source): You can put this solution on YOUR website!I am doing this in two parts (3-4((-2+h)^2) (3-4(+4-4h+k^2 3-16+16h-4h^2 ---------------- -(3-4((-2)^2)/h -(3-16)/h +13/h ------------------ 3-16+16h-4h^2+13/h -13+16h-4h^2+13/h the two 13's cancel (+16h-4h^2)/h I hope that helps Bob
 Money_Word_Problems/457076: If you invest \$5,550.00 in an account for 5 years that earns an annual rate of 6.50% compounded quarterly, what is the future value?1 solutions Answer 313632 by rfer(12662)   on 2011-06-03 13:16:56 (Show Source): You can put this solution on YOUR website!FV=5550(1+0.065/4)^4*5 FV=5550(1.01625)^20 FV=5550*1.38 FV=\$7659.00
 Exponents/457064: 6.334 * 10^4 I just wanted another set of eyes to check over my work. I did 10*10=100, then 100*10=1000, then 1000*10=10000 Then 10000*6.334=63340.1 solutions Answer 313612 by rfer(12662)   on 2011-06-03 10:55:13 (Show Source): You can put this solution on YOUR website!Your answer is correct, but this is a powers of 10 problem. All you have to do is move the decimal 4 places to the right. If you had a minus exponent you would move the decimal to the left.
 Polynomials-and-rational-expressions/456985: Find the following product (y-3)^2 (y-3) (y-3) y^2-6y+9 Is this question correct? Will someone please check, Thank you1 solutions Answer 313610 by rfer(12662)   on 2011-06-03 10:52:08 (Show Source): You can put this solution on YOUR website!Looks good to me. Have a good day. Bob
 Equations/457056: 6 3/4 x 5 1/3 also i dont really understand the steps and why you do them 1 solutions Answer 313606 by rfer(12662)   on 2011-06-03 10:41:20 (Show Source): You can put this solution on YOUR website!this is streight multiplication 6 3/4 x 5 1/3 27/4*16/3=432/12=36
 Numeric_Fractions/457059: what is the sum of the fractions 3/8 and 1/16?1 solutions Answer 313604 by rfer(12662)   on 2011-06-03 10:37:51 (Show Source): You can put this solution on YOUR website!6/16+1/16=7/16
 Money_Word_Problems/456950: You deposit \$500 in account paying 4.5% interest compounded annually. Find the dollar value of the account rounded to the nearest penny after 10 years.1 solutions Answer 313558 by rfer(12662)   on 2011-06-02 23:18:21 (Show Source): You can put this solution on YOUR website!A=500(1.045)^10 A=\$776.48
 Equations/456907: what is 10+3(5a-5a)+10a+31 solutions Answer 313544 by rfer(12662)   on 2011-06-02 21:54:24 (Show Source): You can put this solution on YOUR website!=10a+13
 Triangles/456930: In a triangle, the ratio of the measures of the sides is 2:3:4 and the perimeter is 144. Find the measures of the sides on the triangle.1 solutions Answer 313542 by rfer(12662)   on 2011-06-02 21:52:16 (Show Source): You can put this solution on YOUR website!2x+3x+4x=144 9x=144 x=16 2x=32 3x=48 4x=64
 Linear-equations/456822: Find an equation of the line having the given slope and containing the given point. m = 8/9, (3, -5)1 solutions Answer 313490 by rfer(12662)   on 2011-06-02 19:51:52 (Show Source): You can put this solution on YOUR website!y=8/9x-2.5
 Miscellaneous_Word_Problems/456876: v/-3=61 solutions Answer 313489 by rfer(12662)   on 2011-06-02 19:49:16 (Show Source): You can put this solution on YOUR website!v=6*-3 v=-18
 Pythagorean-theorem/456848: how to solve a multi step equations 1 solutions Answer 313482 by rfer(12662)   on 2011-06-02 19:04:59 (Show Source): You can put this solution on YOUR website!one step at a time.
 Volume/456864: how do you determine the volume of each soild figure 1 solutions Answer 313481 by rfer(12662)   on 2011-06-02 18:59:38 (Show Source): You can put this solution on YOUR website!V=lwh or V=pir^h
 Volume/456865: I am trying to find the volume of a capsule. I am only given the length and width. The length is not the length of the cylinder between the two hemispheres of the capsule. It is of the entire capsule, from end to end of the capsule. This length is 40 feet. The diameter of the cylinder is 5 feet. That is all the information I am given. Thanks for the help!1 solutions Answer 313480 by rfer(12662)   on 2011-06-02 18:58:33 (Show Source): You can put this solution on YOUR website!the two endes of the capsule together form a sphere so you can calculate that A=pid^2 A=3.14*5^2 A=78.5 cu ft -------------- The radius of each end is 2.5 ft so subtract 5 from 40=35 the length of the cylinder -------------- Volume of cylinder V=3.14*r^2*h V=3.14*2.5^2*40 V=785 cu ft ----------- Total volume 78.5+785=863.5 cu ft
 Rectangles/456861: What is the perimeter of a rectangle that is 12 and 1/3 yd long and 5 2/3 yd wide?1 solutions Answer 313479 by rfer(12662)   on 2011-06-02 18:49:28 (Show Source): You can put this solution on YOUR website!2*12.33+2*5.66= 24.6+11.32=35.92 sq yds
 Rational-functions/456654: In the equation x/(x - 6) = 1/(x - 4) why is it true that your solution could never be x = 6 or x = 4?1 solutions Answer 313380 by rfer(12662)   on 2011-06-02 11:20:01 (Show Source): You can put this solution on YOUR website!Because the denominators would become zero, you can not divide or multiply by zero
 Rectangles/456629: write an equation for the area of a rectangle in terms of one variable with a length 5 inches less than the width.1 solutions Answer 313379 by rfer(12662)   on 2011-06-02 11:17:32 (Show Source): You can put this solution on YOUR website!A=x(x-5)
 Radicals/456675: -3x + 6(-2x - 5) = -40 - 5x1 solutions Answer 313377 by rfer(12662)   on 2011-06-02 11:15:41 (Show Source): You can put this solution on YOUR website!-3x-12x-30=-40-5x -10x=-10 x=-10/-10 x=+1
 Quadratic_Equations/456597: What is the Basic tricks to answer a Quadratic Formula?1 solutions Answer 313375 by rfer(12662)   on 2011-06-02 10:55:50 (Show Source): You can put this solution on YOUR website!no tricks, just do the math
 Equations/456651: Hi, I need help solving this problem Remove parentheses and simplify 8p+2q-8(8p-3q+3r)1 solutions Answer 313374 by rfer(12662)   on 2011-06-02 10:52:21 (Show Source): You can put this solution on YOUR website!8p+2q-64p+24q-24r= -56p+22q-24r
 test/456495: What is the square root of 14.44?? How did you solve it??1 solutions Answer 313277 by rfer(12662)   on 2011-06-01 20:23:46 (Show Source): You can put this solution on YOUR website!=3.8
 Volume/456416: A six inch diameter copper pipe water riser fifty feet tall is full of water and needs to be drained down how many gallons will be drained1 solutions Answer 313276 by rfer(12662)   on 2011-06-01 20:22:49 (Show Source): You can put this solution on YOUR website!V=pi*r^2*h V=3.14*0.0625*50 V=9.8125 cu ft ------------- 9.8125*7.48=73.40 gallons
 Linear-equations/456484: I need helping solving this, and then graphing it. 7x>28 The ">" must be underlined. Would the answer be {x|x>4}? (">" underlined)1 solutions Answer 313274 by rfer(12662)   on 2011-06-01 20:13:37 (Show Source): You can put this solution on YOUR website!x=>4
 Probability-and-statistics/456467: A menu has three choices for salad, six main dishes, and four desserts. How many different meals are available if you select a salad, a main dish, and a dessert?1 solutions Answer 313267 by rfer(12662)   on 2011-06-01 19:51:39 (Show Source): You can put this solution on YOUR website!=72 different combinations
 Polynomials-and-rational-expressions/456473: 3^4*3^21 solutions Answer 313266 by rfer(12662)   on 2011-06-01 19:48:40 (Show Source): You can put this solution on YOUR website!81*9=729
 Linear_Algebra/456476: 2x+10=3x+5 what is x=1 solutions Answer 313265 by rfer(12662)   on 2011-06-01 19:47:18 (Show Source): You can put this solution on YOUR website!x=5
 Expressions-with-variables/456454: for which value of m is the expression 15m^2/(3-m) undefined? a. 1 b. 0 c. 3 d. -31 solutions Answer 313254 by rfer(12662)   on 2011-06-01 18:50:14 (Show Source): You can put this solution on YOUR website!B) 0