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# Recent problems solved by 'rfer'

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 Equations/463775: how can I solve this equation -2x + 5 = 131 solutions Answer 317712 by rfer(12657)   on 2011-06-23 11:13:20 (Show Source): You can put this solution on YOUR website!-2x=13-5 -2x=8 x=8/-2 x=-4
 Equations/463784: what is the answer to 8x - 4 = 2x - 3 1 solutions Answer 317711 by rfer(12657)   on 2011-06-23 11:11:43 (Show Source): You can put this solution on YOUR website!6x=1 x=1/6
 Rectangles/463794: What is the maximum area that can be obtained from a rectangle if the perimeter is to be 45 inches?1 solutions Answer 317710 by rfer(12657)   on 2011-06-23 11:09:34 (Show Source): You can put this solution on YOUR website!45/4=11.25 A=11.25^2 A=126.56 sq in
 Linear-equations/463796: How do solve this Linear equation problem -3u-19=2u+161 solutions Answer 317709 by rfer(12657)   on 2011-06-23 11:07:37 (Show Source): You can put this solution on YOUR website!-3u-2u=16+19 -5u=35 u=35/-5 u=-7
 Complex_Numbers/463800: I don't understand how to do this question. I have to multiply (7t-8)(7t+8)1 solutions Answer 317708 by rfer(12657)   on 2011-06-23 11:03:39 (Show Source): You can put this solution on YOUR website!(7t-8)(7t+8) 49t^2+56t-56t-64 answer 49^2-64
 Number-Line/463806: Any point x lies between -7 to -1. What is the range of x ?1 solutions Answer 317707 by rfer(12657)   on 2011-06-23 11:01:40 (Show Source): You can put this solution on YOUR website!range=6
 Graphs/463807: Hi, I am having a little bit of difficuly and hoping one of you smart math tutors would be able to help me? :) Thank you so very much!!!!! Find the slope and the y-intercept of each line whose equation is given. y − 3 = 5 1 solutions Answer 317706 by rfer(12657)   on 2011-06-23 11:00:25 (Show Source): You can put this solution on YOUR website!y=8 y int (0,8) no slope, horizontal line
 Graphs/463813: Hi! I was wondering if someone would be able to help me with this problem? I have been having a hard time grasping the graphs in this chapter. Thank you!!!! :) Write the slope-intercept equation for the line containing the given pair of points. (6,8) and (3,5)1 solutions Answer 317705 by rfer(12657)   on 2011-06-23 10:57:19 (Show Source): You can put this solution on YOUR website!m=(5-8)/(3-6) m=-3/-3 m=1 ============= y=mx+b 5=1*3+b b=2 ============= y=x+2
 Linear-systems/463586: determin the equasion of a line tha passes through (6,18) and (-12,3)1 solutions Answer 317652 by rfer(12657)   on 2011-06-22 20:20:54 (Show Source): You can put this solution on YOUR website!m=(3-18)/(-12-6) m=-15/-18 m=5/6 --------------- y=mx+b 3=5/6*-12+b 3=-10+b b=-13 --------------- y=5/6x-13
 Travel_Word_Problems/463607: jane sold 125 boxes of girl scout cookies.Thin mints cost \$3.00 and shortbread cookies cost \$3.25.In all, \$388.50 worth of boxes were sold.How many of each kin were sold? ___ boxes of thin mints ___ boxes of shortbread 1 solutions Answer 317650 by rfer(12657)   on 2011-06-22 20:16:50 (Show Source): You can put this solution on YOUR website!m+s=125 s=125-m 3m+3.25s=388.50 3m+3.25(125-m)=388.50 3m+406.25-3.25m=388.50 -0.25m=-17.75 m=71 s=125-71=54
 Volume/463643: how many gallons would be in an area 4 ft tallx4 feet widex15 feet long1 solutions Answer 317647 by rfer(12657)   on 2011-06-22 20:11:44 (Show Source): You can put this solution on YOUR website!240 cu ft 240*7.5=1800 gal
 Geometry_Word_Problems/463624: How much greater is the area of a square that has one side equal to 4 feet than a rectangle that measures 3 feet long and 2 feet wide?1 solutions Answer 317644 by rfer(12657)   on 2011-06-22 20:05:12 (Show Source): You can put this solution on YOUR website!square A=4^2 A=16 rectangle A=3*2 A=6 difference 16-6=10 sq ft more in square
 Quadratic_Equations/463628: I am stuck on this problem, any help would be greatly appreciated. Given a rectangle with a fixed perimeter of 372 feet, what dimensions would yield the maximum area? What is the maximum area?1 solutions Answer 317643 by rfer(12657)   on 2011-06-22 20:02:47 (Show Source): You can put this solution on YOUR website!a square is max 372/4=93 ft per side A=93^2 A=8649 sq ft
 Travel_Word_Problems/463645: How far would a person travel in 4 hours and 20 minutes at 55 miles per hour? 1 solutions Answer 317641 by rfer(12657)   on 2011-06-22 20:00:39 (Show Source): You can put this solution on YOUR website!D=55*4.333 D=238.3 miles
 Angles/463664: what are two supplementary angles such that the measure of the first angle is 46 degrees less than three times the measure of the second ?1 solutions Answer 317639 by rfer(12657)   on 2011-06-22 19:58:33 (Show Source): You can put this solution on YOUR website!3x-46+x=180 4x=226 x=56.5 3x-46=123.5
 real-numbers/463469: 10 - 5/6x = -5/6 + 101 solutions Answer 317566 by rfer(12657)   on 2011-06-22 12:16:43 (Show Source): You can put this solution on YOUR website!x=1
 Surface-area/463480: A cube has an edge measuring 7 in. What is the surface area of the cube?1 solutions Answer 317565 by rfer(12657)   on 2011-06-22 12:15:36 (Show Source): You can put this solution on YOUR website!7*7*6=294 sq in
 Finance/463490: Easy Money Inc. charges 22% simple interest (annually) for a 3-year, \$1000 loan. Find the interest for 6 months. 1 solutions Answer 317564 by rfer(12657)   on 2011-06-22 12:13:21 (Show Source): You can put this solution on YOUR website!I=1000*0.22*.5 I=\$110
 Equations/463485: 4(x+2)=281 solutions Answer 317562 by rfer(12657)   on 2011-06-22 12:11:38 (Show Source): You can put this solution on YOUR website!4x+8=28 4x=20 x=5
 Word_Problems_With_Coins/463498: what is the value of six dimes and eight pennies1 solutions Answer 317561 by rfer(12657)   on 2011-06-22 12:10:23 (Show Source): You can put this solution on YOUR website!\$0.68
 Travel_Word_Problems/463496: Calculate the average speed of a car that has traveled 15 km in 3.5 hours1 solutions Answer 317560 by rfer(12657)   on 2011-06-22 12:09:36 (Show Source): You can put this solution on YOUR website!r=15/3.5 r=4.3 kph
 Graphs/463513: -6x +2>51 solutions Answer 317557 by rfer(12657)   on 2011-06-22 12:04:55 (Show Source): You can put this solution on YOUR website!-6x > -3 x < 1/2
 Miscellaneous_Word_Problems/463516: I really appreciate your help. A hardware supplier manufactures three kinds of clamps, types A, B,and C. Production restrictions force it to make 10 more type C clamps than the total of the other types and three times as many B clamps as type A clamps. The shop must produce 330 clamps per day. How many of each type are made per day? A clamps B clamps C clamps1 solutions Answer 317556 by rfer(12657)   on 2011-06-22 12:03:31 (Show Source): You can put this solution on YOUR website!x+3x+(x+3x)+10=330 8x=320 x=40 type A 3x=120 type B 4x+10=170 type C
 Numbers_Word_Problems/463295: if five times a number is added to three times the number the result is the sum of seven times the number and nine1 solutions Answer 317489 by rfer(12657)   on 2011-06-21 21:57:55 (Show Source): You can put this solution on YOUR website!5x+3x=7(x+9) 8x=7x+63 8x-7x=63 x=63
 Travel_Word_Problems/463349: two cars leave a town a the same time. one travels east at 50 miles per hour. the other travels west at 55 miles per hour. in how many hours will they be 315 miles apart?1 solutions Answer 317488 by rfer(12657)   on 2011-06-21 21:55:01 (Show Source): You can put this solution on YOUR website!moving apart at 105mph 315/105=3 hrs
 Triangles/463242: The ratio of the lengths of the legs of a right triangle is 3:4. If the hypotenuse is 20 cm, find the length of the longer leg.1 solutions Answer 317466 by rfer(12657)   on 2011-06-21 20:40:19 (Show Source): You can put this solution on YOUR website!12, 16, 20 triangle
 Triangles/463245: Find the angle equal to 3/7 of its compliment.1 solutions Answer 317462 by rfer(12657)   on 2011-06-21 20:36:11 (Show Source): You can put this solution on YOUR website!x+3/7x=90 1 3/7x=90 x=90/1 3/7 x=90/10/7 x=90*7/10 x=63 -------------- 90-63=27 degrees
 Problems-with-consecutive-odd-even-integers/463249: Write the slope-intercept equation for the line that passes through (-4, -8) and (-3, -2) Can some one help me with this please1 solutions Answer 317459 by rfer(12657)   on 2011-06-21 20:32:59 (Show Source): You can put this solution on YOUR website!slope m=(-2--8)/(-3--4) m=6/1 m=6 ------------------ y=mx+b -2=6*-3+b -2=-18+b b=16 ------------- y=6x+16
 Graphs/463314: 1.y-1/2x=3 Find the y- and x-intercept for the equation. then graph the equation. 2.x=7-y 3.12y-3x=-9 1 solutions Answer 317455 by rfer(12657)   on 2011-06-21 20:27:36 (Show Source): You can put this solution on YOUR website!1) y=1/2x+3 y int=(0,3) x int=(-1.5,0)
 Polynomials-and-rational-expressions/463290: find the slope and the y-intercept of the line, x-2y=6 1 solutions Answer 317451 by rfer(12657)   on 2011-06-21 20:25:19 (Show Source): You can put this solution on YOUR website!-2y=-x+6 y=1/2x-3 slope m=1/2 y int b=-3 (0,-3)
 Miscellaneous_Word_Problems/463308: After taking away 10% from X, I get 3,330. What is number X and what was the value of the 10%?1 solutions Answer 317449 by rfer(12657)   on 2011-06-21 20:22:25 (Show Source): You can put this solution on YOUR website!3330/0.9=3700 10%=370