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# Recent problems solved by 'rfer'

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 Inequalities/230521: solve -2x > 1/91 solutions Answer 170692 by rfer(12657)   on 2009-10-22 23:20:51 (Show Source): You can put this solution on YOUR website!-2x>1/9 x>(1/9)/(-2/1) x>1/9*-1/2 x>-1/18
 Travel_Word_Problems/230453: an airplane is travling 2500 miles at 600 mph how long does it take to arrive?1 solutions Answer 170691 by rfer(12657)   on 2009-10-22 23:16:39 (Show Source): You can put this solution on YOUR website!t=D/r t=2500/600 t=4.167 hrs=4 hrs 10 min
 Linear-systems/230500: For what values of x is the inequality 3x-5x>8 true?1 solutions Answer 170689 by rfer(12657)   on 2009-10-22 23:06:56 (Show Source): You can put this solution on YOUR website!3x-5x>8 -2x>8 x<-4
 Linear-systems/230499: Solve the following system of equations for x and y 3x+5y=21 2x-y=11 solutions Answer 170688 by rfer(12657)   on 2009-10-22 23:02:37 (Show Source): You can put this solution on YOUR website!3x+5y=21 2x-y=1, y=2x-1 -------------------- 3x+5(2x-1)=21 3x+10x-5=21 13x=26 x=2 ----------------- 2(2)-y=1 4-y=1 -y=-3 y=3 -------------------- proof 3(2)+5(3)=21 6+15=21
 Linear_Equations_And_Systems_Word_Problems/230514: In triangle ABC, the measure of angle B is 2 degrees more than three times the measure of angle A. The measure of angle C is 8 degrees more than the measure of angle A. Find the angle measures.1 solutions Answer 170687 by rfer(12657)   on 2009-10-22 22:50:41 (Show Source): You can put this solution on YOUR website!a+3a+2+a+8=180 5a+10=180 5a=170 a=34 degrees b=3a+2=104 degrees c=a+8=42 degrees
 Linear_Equations_And_Systems_Word_Problems/230515: In triangle PQR, the measure of angle Q is three times the measure of angle P. The measure of angle R is 30 degrees greater than the measure of angle P. Find the angle measures.1 solutions Answer 170686 by rfer(12657)   on 2009-10-22 22:46:22 (Show Source): You can put this solution on YOUR website!3p+p+p+30=180 5p=150 p=30 degrees q=3p=90 degrees r=p+30=60 degrees
 Equations/230406: How do I solve this equation, please show steps. 4x - 5(3x + 10) = 126 I've tried distrubuting 5 to 3x and 10 to get 15x + 50. So then my equation is 4x - 15 + 50. So I add 15 to itself crossing it out, then I add it to 50 which is 65. Im stuck on this part I dont know what to do. 1 solutions Answer 170620 by rfer(12657)   on 2009-10-22 19:34:56 (Show Source): You can put this solution on YOUR website!4x-5(3x+10)=126 4x-15x-50=126 add 50 and combine like quanities -11x=176 divide by -11 x=-16
 Probability-and-statistics/230405: For the following scores, find the (a) mean, (b) median, (c) sum of squared deviations, (d) variance, and (e) standard deviation: 1,112; 1,245; 1,361; 1,372; 1,472 1 solutions Answer 170615 by rfer(12657)   on 2009-10-22 19:30:48 (Show Source): You can put this solution on YOUR website!5/8
 Distributive-associative-commutative-properties/230393: please solve this expression: 10x-3(7-2x)+181 solutions Answer 170613 by rfer(12657)   on 2009-10-22 19:29:49 (Show Source): You can put this solution on YOUR website!10x-3(7-23x)+8 10x-21+6x+18 16x-3
 Linear-equations/230362: Find the slope- intercept equation of the line that has given characteristics slope 7.7 and y-intercept ( 0,-5). The slope-intercept equation is y= I came up with y= -2 am I close1 solutions Answer 170608 by rfer(12657)   on 2009-10-22 19:19:53 (Show Source): You can put this solution on YOUR website!your given everything you need y=mx+b m=slope b= y int y=7.7x-5
 Pythagorean-theorem/230391: does a right triangle with the dimensions of 8cm,9cm,and 12cm exist?1 solutions Answer 170603 by rfer(12657)   on 2009-10-22 19:13:26 (Show Source): You can put this solution on YOUR website!yes with slight error 12.04 not 12
 Exponents-negative-and-fractional/230388: -3.6 + x over 3 = 3.2 1 solutions Answer 170600 by rfer(12657)   on 2009-10-22 19:10:46 (Show Source): You can put this solution on YOUR website!-3.6+x/3=3.2 x/3=6.8 x=6.8*3 x=20.4
 Exponents-negative-and-fractional/230370: 2 5/8 x 4/7 x 121 solutions Answer 170599 by rfer(12657)   on 2009-10-22 19:07:35 (Show Source): You can put this solution on YOUR website!2 5/8*4/7*12 21/8*4/7*12/1 1008/56=18
 Linear-equations/230379: find the slope and the y-intecept f(x)= -9x-7. The slope is_______ and the y-intecept is (0, ___) I came up with the slope is 2 and the y-intecept is (0, 16) am I close1 solutions Answer 170598 by rfer(12657)   on 2009-10-22 19:04:12 (Show Source): You can put this solution on YOUR website!y=mx+b m=slope b=y int m=-9 b=-7, (0,-7)
 Exponential-and-logarithmic-functions/230266: b=+-0.5^1/5730 b=0.999879 I don't understand how they got 0.999879 from the first line. 1 solutions Answer 170572 by rfer(12657)   on 2009-10-22 18:13:27 (Show Source): You can put this solution on YOUR website!first solve the fraction it =0.00017452 the take .5 to that power the answer is b=0.999879
 Numeric_Fractions/230351: when you get done simplifying a fraction, and it turns out inproper what do you 1 solutions Answer 170569 by rfer(12657)   on 2009-10-22 18:07:09 (Show Source): You can put this solution on YOUR website!reduce to a mixed number divide numerator by denominator
 Triangles/230346: How do you find the perimeter of a right triangle when all they give me is that one angle equals 60 degrees and the hypotnuse is 48 cm? Thanks for your time1 solutions Answer 170568 by rfer(12657)   on 2009-10-22 18:06:00 (Show Source): You can put this solution on YOUR website!cosB=a/c 0.5=a/48 0.5*48=a a=24 ------------ cosA=b/c 0.866=b/48 41.6=b ------------- P=41.6+48+24 P=113.6 cm
 Triangles/230348: The area of a triangle is 102 m 2 . The base of the triangle is 17 m. What is the height of the triangle?1 solutions Answer 170563 by rfer(12657)   on 2009-10-22 17:54:26 (Show Source): You can put this solution on YOUR website!A=.5*b*h h=A/.5b h=102/.5*17 h=102/8.5 h=12 m
 Linear_Algebra/230349: C=5/9(F-32)for F. Solve the formula for the given variable1 solutions Answer 170562 by rfer(12657)   on 2009-10-22 17:52:21 (Show Source): You can put this solution on YOUR website!F=9/5(C+32)
 Inequalities/230343: Please help in solving 3m-8>-30m+5m I keep getting m > 4.31 solutions Answer 170560 by rfer(12657)   on 2009-10-22 17:50:12 (Show Source): You can put this solution on YOUR website!3m-8>-30m+5m 3m-8>-25m -8>-28m -8/-28>m 0.28571>m
 Money_Word_Problems/230261: an account offers 4.5% interest compoundd annually. if you deposited \$6000 in the account, what would be the account balance at the end of 15 years?1 solutions Answer 170558 by rfer(12657)   on 2009-10-22 17:45:35 (Show Source): You can put this solution on YOUR website!A=P(1+r)^15 A=6000(1.045)^15 A=6000(1.935282443) A=\$11611.69
 Coordinate-system/230329: slope: the problem deals with y2-y1/x2-x1. how problem ask me to solve (0,0),(3,1)?can you show me how to solve it. Thank You 1 solutions Answer 170553 by rfer(12657)   on 2009-10-22 17:35:18 (Show Source): You can put this solution on YOUR website!it becomes 1-0/3-0 1/3=slope rise over run
 Exponents/230341: please solve: 1 solutions Answer 170551 by rfer(12657)   on 2009-10-22 17:33:13 (Show Source): You can put this solution on YOUR website!2(x+5)<8 2x+10<8 2x<-2 x<-1
 Equations/230328: how would you solve.... 7/8 + t = 1/41 solutions Answer 170550 by rfer(12657)   on 2009-10-22 17:31:38 (Show Source): You can put this solution on YOUR website!7/8+t=1/4 t=1/4-7/8 t=2/8-7/8 t=-5/8
 expressions/230330: y+1=x+2 write equation in stardard form1 solutions Answer 170549 by rfer(12657)   on 2009-10-22 17:30:19 (Show Source): You can put this solution on YOUR website!y=x+1
 Linear-equations/230333: m= -3,(1,5) Y= I come up with y= -3 am I close1 solutions Answer 170545 by rfer(12657)   on 2009-10-22 17:28:31 (Show Source): You can put this solution on YOUR website!-3 is the slope in the ordered pair x=1 and y=5 the y int is +8
 test/230336: which expression is equivalent to x^6*x^2 ? A)x^4x^3 B) x^5x^3 C)x^7x^3 d) none 1 solutions Answer 170544 by rfer(12657)   on 2009-10-22 17:25:15 (Show Source): You can put this solution on YOUR website!when multiplied exponents add so (B) is equivalent
 Square-cubic-other-roots/230334: what is the square root of 16 plus the cubed root of 8 ?1 solutions Answer 170542 by rfer(12657)   on 2009-10-22 17:23:28 (Show Source): You can put this solution on YOUR website!4+2=6
 absolute-value/230007: What is the solution set for [8m+4]=2 I got -1/4 and -3/4 just checking to see if I am right. Thanks1 solutions Answer 170409 by rfer(12657)   on 2009-10-21 21:49:22 (Show Source): You can put this solution on YOUR website!8m+4=2 8m=-2 m=-2/8 m=-1/4
 Numeric_Fractions/229996: how do we solve this problem 1/2+(2/3divided3/4)-(4/5x5/6)=1 solutions Answer 170408 by rfer(12657)   on 2009-10-21 21:47:11 (Show Source): You can put this solution on YOUR website!1/2+(2/3/3/4)-(4/5*5/6) 1/2+(2/3*4/3)-20/30 1/2+8/9-20/30 1/2+8/9-2/3 1/2+8/9-6/9 1/2+2/9 9/18+4/18=13/18
 Distributive-associative-commutative-properties/229992: 4t-8+12=3-4t-11 1 solutions Answer 170404 by rfer(12657)   on 2009-10-21 21:40:42 (Show Source): You can put this solution on YOUR website!4t-8+12=3-4t-11 4t+4=-4t-8 8t=-12 t=-1.5