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# Recent problems solved by 'rfer'

 Polynomials-and-rational-expressions/439948: The cost of carpet is directly proportional to the amount of carpet purchased. if 17 sq yards cost \$612, find the cost of 13 sq yards. 1 solutions Answer 304023 by rfer(15570)   on 2011-04-24 20:20:36 (Show Source): You can put this solution on YOUR website! 17/612=13/x 17x=7956 x=\$468
 Equations/439612: The scale of a map is 1 in.:17.5 mi. What is the actual distance corresponding to a map distance of 5 in? 1 solutions Answer 303827 by rfer(15570)   on 2011-04-23 22:23:10 (Show Source): You can put this solution on YOUR website! 1/17.5=5/x x=87.5 mi
 Average/439671: x-2>13 on the les than thing theres a little line under it 1 solutions Answer 303819 by rfer(15570)   on 2011-04-23 22:17:14 (Show Source): You can put this solution on YOUR website! x >= 15
 Numeric_Fractions/439664: Perform the indicated operation and, if possible, simplify. -14/45 divid by 26/27 1 solutions Answer 303818 by rfer(15570)   on 2011-04-23 22:16:24 (Show Source): You can put this solution on YOUR website! -14/45*27/26=-378/1170=-21/65
 Travel_Word_Problems/439413: Two trains leave the station at the same time, one heading west and the other east. THe westbound train travels 14 miles per hour faster than the eastbound train. If the two trains are 760 miles apart after 4 hours, what is the rate of the westbound train? DO NOT ROUND 1 solutions Answer 303664 by rfer(15570)   on 2011-04-22 22:35:45 (Show Source): You can put this solution on YOUR website! 760/4=190 x+x+14=190 2x=176 x=88 mph x+14=102 mph
 Rational-functions/438142: Simplify x-4/2x - x-6/3x 1 solutions Answer 303091 by rfer(15570)   on 2011-04-19 23:27:24 (Show Source): You can put this solution on YOUR website! x-12/6x-x-12/6x= -24/6x= -4x
 Expressions-with-variables/438134: Simplify: -3w - 5(2y + 7) + 5w - 1 - 6y 1 solutions Answer 303090 by rfer(15570)   on 2011-04-19 23:24:54 (Show Source): You can put this solution on YOUR website! -3w-10y-35+5w-1-6y= 2w-16y-36
 Equations/438208: Express using a positive exponent s^-7 1 solutions Answer 303089 by rfer(15570)   on 2011-04-19 23:22:49 (Show Source): You can put this solution on YOUR website! 1/(s^7)
 Equations/438209: Convert to decimal notation 8.49 x 10^7 1 solutions Answer 303088 by rfer(15570)   on 2011-04-19 23:21:51 (Show Source): You can put this solution on YOUR website! 84,900,000
 Number-Line/438201: n+3 1/2= 6 2/3 on a numberline 1 solutions Answer 303085 by rfer(15570)   on 2011-04-19 23:02:15 (Show Source): You can put this solution on YOUR website! n=6 4/6-3 3/6 n=3 1/6
 Linear_Equations_And_Systems_Word_Problems/438029: One Number is triple another. The differnce betwen the larger and smaller is 84. Find the Numbers? How do I set this equation up. I have started with letting one number= A and another number= 3A. Would this be correct? 1 solutions Answer 303003 by rfer(15570)   on 2011-04-19 18:46:12 (Show Source): You can put this solution on YOUR website! 3x-x=84 2x=84 x=42 3x=126 ------------ 126-42=84
 Percentage-and-ratio-word-problems/438041: An \$80 sweater was marked down 20%. What is the sale price of the sweater? 1 solutions Answer 303000 by rfer(15570)   on 2011-04-19 18:39:02 (Show Source): You can put this solution on YOUR website! 80*0.8=\$64
 Linear-equations/438049: SOLVE USING THE ADDITION AND MULTIPLICATION PRINCIPLES. 1+4x<21 1 solutions Answer 302999 by rfer(15570)   on 2011-04-19 18:37:21 (Show Source): You can put this solution on YOUR website! 4x < 20 x < 5
 Quadratic_Equations/438019: 3m+33=7m-3 1 solutions Answer 302990 by rfer(15570)   on 2011-04-19 18:16:18 (Show Source): You can put this solution on YOUR website! 36=4m 9=m
 percentage/438032: 40% of what number is 12? 1 solutions Answer 302989 by rfer(15570)   on 2011-04-19 18:15:17 (Show Source): You can put this solution on YOUR website! 12/0.4=30
 Pythagorean-theorem/438025: (a) use the Pythagorean theorem to determine the length of the unknown side of the triangle, (b) determine the perimeter of the triangle, and (c) determine the area of the triangle. using a right triangle, the left side is 15 in., the right side is 12 in. and the bottom is a 1 solutions Answer 302988 by rfer(15570)   on 2011-04-19 18:14:18 (Show Source): You can put this solution on YOUR website! c^2=144+225 c^2=369 c=19.2 in P=46.2 in
 Angles/438026: find the length and midpoint of A(6, -2) and B(-4, 2) 1 solutions Answer 302987 by rfer(15570)   on 2011-04-19 18:11:07 (Show Source): You can put this solution on YOUR website! length=10.8 midpoint=(1,0)
 test/437985: When multiple discounts are used, if an item is first discounted by 40%, then again by 30%, and then again by 10%, the final or cumulative discount is ______ off the original price. a. 62.2% b. 70% c. 72.6% d. 80% 1 solutions Answer 302986 by rfer(15570)   on 2011-04-19 18:07:56 (Show Source): You can put this solution on YOUR website! A) 62.2%
 Travel_Word_Problems/438020: If you travel 756 miles in 10 1/4 hours, what is your rate of travel per hour? If you type 632 words in 11min, what is your rate per minute? 1 solutions Answer 302984 by rfer(15570)   on 2011-04-19 18:05:05 (Show Source): You can put this solution on YOUR website! 756/10.25=73.8 mph 632/11=57.5 wpm
 Polynomials-and-rational-expressions/437610: (s+10)(s-8) 1 solutions Answer 302752 by rfer(15570)   on 2011-04-18 22:10:12 (Show Source): You can put this solution on YOUR website! s^2-8s+10s-80= s^2+2s-80
 Mixture_Word_Problems/437644: a number is divided by 5 4 is subtracted from the quotient then 6 is added to the difference the result is 10 what is the number? 1 solutions Answer 302750 by rfer(15570)   on 2011-04-18 22:06:29 (Show Source): You can put this solution on YOUR website! x/5-4+6=10 x/5+2=10 x/5=8 x=8*5 x=40
 Linear-equations/437532: identify the slope and y- intercept of the line with the given equation. Use the slope and y-intercept to graph the equation. show work y = -2x + 3 1 solutions Answer 302715 by rfer(15570)   on 2011-04-18 20:46:39 (Show Source): You can put this solution on YOUR website! slope m=-2 y int=3 (0,3)
 Probability-and-statistics/437564: A health inspector must visit 3 of 13 restaurants on Monday. In how many was can she pick the 3 restaurants? 1 solutions Answer 302713 by rfer(15570)   on 2011-04-18 20:44:09 (Show Source): You can put this solution on YOUR website! 3*13=39
 Linear_Equations_And_Systems_Word_Problems/437585: How do you write out equation formulas from a word problem? 1 solutions Answer 302711 by rfer(15570)   on 2011-04-18 20:42:26 (Show Source): You can put this solution on YOUR website! post one
 expressions/437588: Write the equation and solve: three times a number subtracted from eight is 35 1 solutions Answer 302710 by rfer(15570)   on 2011-04-18 20:41:24 (Show Source): You can put this solution on YOUR website! 8-3x=35 -3x=27 x=-9
 Graphs/437557: I need to find the vertex and the x coordinates as well as the line of symmetry, and the maximum or minimum value for this function and graph too. The problem is -2x^2+2x+6 I have gotten the answers 1/2 and 13/2 i just ddo not know which is what??? 1 solutions Answer 302708 by rfer(15570)   on 2011-04-18 20:39:59 (Show Source): You can put this solution on YOUR website! vertex=(0.5,6.5) axis=0.5 x coordinates =(-1.3,0), (2.3,0) max = 6.5 y int=6 it opens down
 Graphs/437566: Multiply (x+1/5)(x+1/3) 1 solutions Answer 302703 by rfer(15570)   on 2011-04-18 20:28:45 (Show Source): You can put this solution on YOUR website! x^2+1/3x+1/5x+1/15= x^2+5/15x+3/15x+1/15= x^2+8/15x+1/15
 Volume/437578: amber can read 20 pages in 45 minutes how many can she read im an hour and a half 1 solutions Answer 302702 by rfer(15570)   on 2011-04-18 20:26:00 (Show Source): You can put this solution on YOUR website! 20/45=x/90 45x=1800 x=40
 Exponents/437450: Write each answer in exponential form with only postive exponents 9^2/3 over 9^-1/3 1 solutions Answer 302670 by rfer(15570)   on 2011-04-18 18:59:38 (Show Source): You can put this solution on YOUR website! 1^3/3=1
 Average/437455: 6x10^6 divided by 3x10^-3 1 solutions Answer 302665 by rfer(15570)   on 2011-04-18 18:48:52 (Show Source): You can put this solution on YOUR website! 2x10^9 divide the numbers and subtract the exponents 6--3=9
 Rectangles/437515: What is the area of the rectangular cage with a side of length 10meters? I do not understand this?!!! 1 solutions Answer 302662 by rfer(15570)   on 2011-04-18 18:45:10 (Show Source): You can put this solution on YOUR website! I am guessing that it is a square with all sides =10 A=10*10 A=100 meters