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# Recent problems solved by 'rfer'

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 Numbers_Word_Problems/709090: if the sum of a number and six is tripled, the result is three less than twice the number. find the number1 solutions Answer 436375 by rfer(12678)   on 2013-01-31 21:44:21 (Show Source): You can put this solution on YOUR website!3(x+6)=2x-3 3x+18=2x-3 x=-21 -------------- 3(-21+6)=2*-21-3 -45=-45
 Exponents/709073: reduce or solve 20m to the 5th power over 4m to the 2nd power 1 solutions Answer 436374 by rfer(12678)   on 2013-01-31 21:41:36 (Show Source): You can put this solution on YOUR website!20m^5/4m^2=5m/^3
 Angles/709097: The difference between two complementary angels is 14. What is the measure of one of those angles?1 solutions Answer 436371 by rfer(12678)   on 2013-01-31 21:39:32 (Show Source): You can put this solution on YOUR website!x+x+14=90 2x=90-14 2x=76 x=76/2 x=38 x+14=52
 Square-cubic-other-roots/709094: cube root of 567 please1 solutions Answer 436370 by rfer(12678)   on 2013-01-31 21:36:43 (Show Source): You can put this solution on YOUR website!=8.28
 Square-cubic-other-roots/709089: what the square root of -(7)^21 solutions Answer 436369 by rfer(12678)   on 2013-01-31 21:35:48 (Show Source): You can put this solution on YOUR website!=-7
 Signed-numbers/709004: y=mx+b, for m1 solutions Answer 436354 by rfer(12678)   on 2013-01-31 19:37:05 (Show Source): You can put this solution on YOUR website!y-b=mx (y-b)/x=m
 Money_Word_Problems/708319: You deposit \$2500 in an account that pays 3.5% annual interest compounded continuously. What is the balance after 8 years?1 solutions Answer 436085 by rfer(12678)   on 2013-01-30 15:31:23 (Show Source): You can put this solution on YOUR website!A=Pe^rt A=2500(2.7183)^0.035*8 A=2500(2.7183)^0.28 A=2500(1.32313) A=\$3307.80
 Equations/708342: What is the answer to 2x+1=15? 1 solutions Answer 436083 by rfer(12678)   on 2013-01-30 15:25:19 (Show Source): You can put this solution on YOUR website!2x=14 x=14/2 x=7
 Proportions/708358: 1.4/56 = 2.3/x1 solutions Answer 436082 by rfer(12678)   on 2013-01-30 15:24:10 (Show Source): You can put this solution on YOUR website!1.4x=128.8 x=128.8/1.4 x=92
 test/708350: (2x - 3) (2x + 3) Write the products1 solutions Answer 436081 by rfer(12678)   on 2013-01-30 15:22:45 (Show Source): You can put this solution on YOUR website!4x^2+6x-6x-9 =4x^2-9
 Finance/708353: Please help me sole this equation in simple interest I=\$30, r=4%, t=2 years1 solutions Answer 436080 by rfer(12678)   on 2013-01-30 15:21:04 (Show Source): You can put this solution on YOUR website!I=Prt 30=P*0.04*2 30/0.08=P \$375=P
 Distributive-associative-commutative-properties/708357: How do you solve 2x-(8x-1)-151 solutions Answer 436079 by rfer(12678)   on 2013-01-30 15:18:59 (Show Source): You can put this solution on YOUR website!2x-8x+1-15=-6x-14
 Percentage-and-ratio-word-problems/708354: Stan spent 65% of his money and had 266 left How much had he left at first?1 solutions Answer 436078 by rfer(12678)   on 2013-01-30 15:17:58 (Show Source): You can put this solution on YOUR website!266/0.35=\$760
 Numeric_Fractions/708276: if 8x8=13x5 then prove it1 solutions Answer 436037 by rfer(12678)   on 2013-01-30 11:57:05 (Show Source): You can put this solution on YOUR website!64=65 won't prove
 Numeric_Fractions/708282: 7/2 divided by 12/3 = 1 solutions Answer 436034 by rfer(12678)   on 2013-01-30 11:55:33 (Show Source): You can put this solution on YOUR website!7/2*3/12=21/24=7/8
 Numbers_Word_Problems/708277: Five less than the product of two and a number is six more than that number. Find the number.1 solutions Answer 436033 by rfer(12678)   on 2013-01-30 11:54:33 (Show Source): You can put this solution on YOUR website!2x-5=x+6 x=11
 Quadratic_Equations/708082: How do I solve for x in this equation: y=0.5x^3 when y=71 solutions Answer 435980 by rfer(12678)   on 2013-01-29 23:14:53 (Show Source): You can put this solution on YOUR website!7/0.5=x^3 14=x^3 curt 14=x x=2.41
 Inequalities/708100: what is the answer to the inequality 5-6(x-4)<-(6-x) 1 solutions Answer 435979 by rfer(12678)   on 2013-01-29 23:09:57 (Show Source): You can put this solution on YOUR website!5-6x+24 < -6+x -7x < -6-29 -7x < -35 x < -35/-7 x < 5
 Linear-equations/708130: Fine the slope of the line that passes through the pair of points? (2,-2) (-3,-4)1 solutions Answer 435978 by rfer(12678)   on 2013-01-29 23:03:38 (Show Source): You can put this solution on YOUR website!slope m=(-4--2)/(-3-2) m=-2/-5 m=2/5
 Human-and-algebraic-language/707967: Five less than a product of a number and two is twenty one1 solutions Answer 435934 by rfer(12678)   on 2013-01-29 19:37:10 (Show Source): You can put this solution on YOUR website!2x-5=21 2x=26 x=26/2 x=13
 test/707964: -24/(-5/12)1 solutions Answer 435932 by rfer(12678)   on 2013-01-29 19:36:16 (Show Source): You can put this solution on YOUR website!-24*-12/5=+57.6=+57 3/5
 Angles/707423: One of two supplementary angles is 8 degrees larger than the other. Find the measure of the larger angle.1 solutions Answer 435695 by rfer(12678)   on 2013-01-28 19:58:24 (Show Source): You can put this solution on YOUR website!x+x+8=180 2x=180-8 2x=172 x=172/2 x=86 x+8=94
 Travel_Word_Problems/707426: A bus leaves Los Angeles traveling at 50 mi/hr. An hour later a car traveling on the same road leaves at 70 mi/hr to try and overtake the bus. How far from Los Angeles does the car overtake the bus?1 solutions Answer 435694 by rfer(12678)   on 2013-01-28 19:56:52 (Show Source): You can put this solution on YOUR website!50 mi lead 20 mph overtake 50/20=2.5 hrs 2.5*50+50=175 miles
 test/707039: Find an equation of a line that passes through the points (-1,2) and (5,0) Thank you1 solutions Answer 435487 by rfer(12678)   on 2013-01-28 01:46:59 (Show Source): You can put this solution on YOUR website!slope m=(0-2)/(5--1) m=-2/6 m=-1/3 ---------------- y=mx+b 2=-1/3*-1+b 2=1/3+b b=5/3 ------------ y=-1/3x+5/3
 Expressions-with-variables/707002: solve 2+2[b-5(b-3)]1 solutions Answer 435486 by rfer(12678)   on 2013-01-28 01:42:42 (Show Source): You can put this solution on YOUR website!2+2[b-5(b-3)] 2+2[b-5b+15} 2+8b+30 =8b+32
 Equations/707020: Please help me solve this equation 4/7x = -121 solutions Answer 435485 by rfer(12678)   on 2013-01-28 01:38:14 (Show Source): You can put this solution on YOUR website!x=-12/(4/7) x=-12*7/4 x=-21
 Expressions-with-variables/707040: How do we do this problem y=-2x+12 3y+x=111 solutions Answer 435484 by rfer(12678)   on 2013-01-28 01:35:57 (Show Source): You can put this solution on YOUR website!y=-2x+12 ----------- 3y+x=11 3(-2x+12)+x=11 -6x+36+x=11 -5x=11-36 -5x=-25 x=-25/-5 x=5 -------------- 3y+5=11 3y=11-5 3y=6 y=6/3 y=2 --------------- (5,2) ----------- 2=-2*5+12 2=-10+12 2=2
 test/706922: Solve I=PRT for P1 solutions Answer 435452 by rfer(12678)   on 2013-01-27 20:48:32 (Show Source): You can put this solution on YOUR website!P=I/rt
 Money_Word_Problems/706931: \$1500.00 divided by 2%=1 solutions Answer 435450 by rfer(12678)   on 2013-01-27 20:46:36 (Show Source): You can put this solution on YOUR website!2500/0.02=\$75,000
 Numeric_Fractions/706972: y + 3/4 =9 1/21 solutions Answer 435448 by rfer(12678)   on 2013-01-27 20:44:53 (Show Source): You can put this solution on YOUR website!y=38/4-3/4 y=35/4=8 3/4
 Money_Word_Problems/706975: If a business gains 8% in one year and loses 3% the following year, what is the percentage gain over two years?1 solutions Answer 435445 by rfer(12678)   on 2013-01-27 20:43:18 (Show Source): You can put this solution on YOUR website!1000*1.08=1080/1.03=1048.54 48.54/1000=0.04854=4.854% I like to use fictitous figures for these kind of problems. It makes it easier to see what is happening.