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# Recent problems solved by 'rfer'

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 Inequalities/468179: the smiths have saved \$25,000 toward the purchase of a new car. if the sales tax if 5 % the purchase price of the smiths new car before taxes cannot exceed what ?1 solutions Answer 321244 by rfer(12662)   on 2011-07-07 20:39:00 (Show Source): You can put this solution on YOUR website!25000/1.05=\$23,809.52
 Coordinate-system/468174: graph: y=4x+80, y=1/2x+10 where do they intercept?1 solutions Answer 321241 by rfer(12662)   on 2011-07-07 20:37:23 (Show Source): You can put this solution on YOUR website!1/2x+10=4x+80 -3.5x=70 x=-20 ------------- y=4*-20+80 y=-80+80 y=0 ----------- intercept (-20,0) ---------------- 0=1/5*-20+10
 Inequalities/468176: a jewelry salesman can earn either a salary of 2,500 a month or a salary of 1,000 a month plus 10% of all sales .how much does he have to sell for the second choice to earn him more than the first choice ?1 solutions Answer 321237 by rfer(12662)   on 2011-07-07 20:30:43 (Show Source): You can put this solution on YOUR website!1500/0.1=\$15,000
 Functions/468159: Please I need hel dipalma uivesity has a faculity reduction and lost 1/14 of its faculityu If 286 of it faculity was left after the reduction how many was there orginally.1 solutions Answer 321231 by rfer(12662)   on 2011-07-07 20:00:09 (Show Source): You can put this solution on YOUR website!286/(13/14)= 286*14/13=308
 Evaluation_Word_Problems/468071: The pitch of a roof is the ratio of the rise to the half-span. If a roof has a rise of 6 feet and a span of 30 feet, what is the pitch? 1 solutions Answer 321213 by rfer(12662)   on 2011-07-07 18:46:07 (Show Source): You can put this solution on YOUR website!6/30=1/5 one ft rise in five ft run
 Systems-of-equations/468135: 2x+7-3x=-x+121 solutions Answer 321211 by rfer(12662)   on 2011-07-07 18:42:15 (Show Source): You can put this solution on YOUR website!-x+x=5 no solution
 Linear-systems/468082: i am having trouble solving equations. where can i get help to make them seem simple 1 solutions Answer 321210 by rfer(12662)   on 2011-07-07 18:40:21 (Show Source): You can put this solution on YOUR website!post a problem that we can see.
 Systems-of-equations/468136: 3(x-1)+5=15x+7-4-4(3x+1)+31 solutions Answer 321209 by rfer(12662)   on 2011-07-07 18:39:30 (Show Source): You can put this solution on YOUR website!3x-3+5=15x+7-4-12x-4+3 3x+2=3x+2 no solution
 Linear-equations/467760: find the indicated outputs for f(x) - 5x^2 -3x. I am having difficulty in trying to figure out this problem. I thought that it is five x to the second power which means five times five which would make it 25x minus 3x but the answer comes up incorrect. Could you please help me?1 solutions Answer 321018 by rfer(12662)   on 2011-07-06 21:49:08 (Show Source): You can put this solution on YOUR website!It says to use the indicated outputs, what are they? If for example x=2 f(2)=-5*2^2-3*2 f(2)=-5*4-6 f(2)=-20-6 f(2)=-26 ----- Follow that example.
 Radicals/467823: Find the length of the third side of the right triangle. Assume that c represents the length of the hypotenuse. Give an exact answer and, if appropriate, an approximation to three decimal places. a = 3, b = 5, c = ? 1 solutions Answer 321014 by rfer(12662)   on 2011-07-06 21:37:51 (Show Source): You can put this solution on YOUR website!9+25=34 sq rt 34=5.83 C
 Expressions-with-variables/467820: Does the equation 3(x-1)+5=15x+7-4-4(3x+1)+3 has infinitely many solutions, one solution, or no solution?1 solutions Answer 321013 by rfer(12662)   on 2011-07-06 21:36:00 (Show Source): You can put this solution on YOUR website!3x-3+5=15x-4-12x-4+3 3x+2=3x+3 3x-3x=1 no solution
 Percentage-and-ratio-word-problems/467782: If 21% of the group voted to change its bylaws and 19% voted against the change, how many people did not vote? The group has 1410 members. Thank you very much for your help1 solutions Answer 321011 by rfer(12662)   on 2011-07-06 21:33:44 (Show Source): You can put this solution on YOUR website!0.21+0.19=0.40 voted 1.00-.40=0.60 not voted 1410*0.6=846 did not vote
 Equations/467735: Solve 126-a=-9a1 solutions Answer 320957 by rfer(12662)   on 2011-07-06 19:10:42 (Show Source): You can put this solution on YOUR website!8x=-126 x=-15.75
 Money_Word_Problems/467736: . a. Solve for n: 2(n - 1) = 3(n + 5) b. Find the zero of the function f(x)= 8 – 2x 1 solutions Answer 320956 by rfer(12662)   on 2011-07-06 19:09:33 (Show Source): You can put this solution on YOUR website!A) 2n-2=3n+15 -n=17 n=-17 B) (0,8) (4,0)
 Equations/467738: the odometer on Mr. Sweden's car read 36,345.8 mi. when he filled up with gas . The next time he bought gas , it took 8.6 gal. to fill up and he noticed his odometer read 36,504.9 mi . how many miles per gallon does Mr. Sweden's car get ?1 solutions Answer 320955 by rfer(12662)   on 2011-07-06 19:04:07 (Show Source): You can put this solution on YOUR website!(36504.9-36345.8)/8.6=18.5 mpg
 Angles/467740: Hello I am in need of help with a problem. The directions are, use a algebraic equation to find the measures of the two angles discribed. Begin by letting x represent the degree measure of the angle's complement or its supplement. The measure of the angle is 81degrees more than twice that of its supplement. I would really appreciate it if someone could help me. Thank you in advance 1 solutions Answer 320954 by rfer(12662)   on 2011-07-06 19:01:54 (Show Source): You can put this solution on YOUR website!x+2x+81=180 3x=99 x=33 2x+81=147
 Polynomials-and-rational-expressions/467743: omg! please help with these fractions! (1/16x^4 + 3/7x^3 + 7/8x^2 +4) + (-9/16x^4 + 1/8x^2 -4)1 solutions Answer 320952 by rfer(12662)   on 2011-07-06 18:59:05 (Show Source): You can put this solution on YOUR website!=-1/2x^4+3/7x^3+x^2
 Money_Word_Problems/467624: At his son's birth, a man invested \$2,000 in savings at 6% for his son's college education. In 19 years, how much, approximately, will be available? 1 solutions Answer 320882 by rfer(12662)   on 2011-07-06 14:01:49 (Show Source): You can put this solution on YOUR website!A=2000(1.06)^19 A=2000*3.0256 A=\$6051.20
 Triangles/467633: The sum of the measures of angles of a triangle are 180. If the largest angle is nine time larger than the smallest angle, and the third angle is 70 degrees larger than the smallest angle, find the measure of the angles1 solutions Answer 320881 by rfer(12662)   on 2011-07-06 13:58:09 (Show Source): You can put this solution on YOUR website!x+9x+x+70=180 11x=110 x=10 9x=90 x+70=80
 Evaluation_Word_Problems/467634: Use scientific notation to divide the two numbers. Express answer using scientific notation; retain at least three decimal places. Please show all work. (8.7•10^9)•(3.22•10^2)1 solutions Answer 320880 by rfer(12662)   on 2011-07-06 13:56:05 (Show Source): You can put this solution on YOUR website!=28.014x10^11 it becomes =2.8014x10^12 multiply the numbers and add the exponents.
 test/467636: Hi i need help with ny practice test that my teacher gave me and is big package and im doing " Percent Word Problems" 1.what percent of 126 is 22 ? 2. what percent of 137.4 is 96? 3.79.9 is 90% of what ? 4.73% of what is 156.4 ?1 solutions Answer 320879 by rfer(12662)   on 2011-07-06 13:52:16 (Show Source): You can put this solution on YOUR website!1) 22/126=0.175=17.5% 2) 96/137.4=0.70=70% 3) 79.9/0.90=88.78 4) 156.4/0.0473=3306.55
 Travel_Word_Problems/467496: Traveling via car a total distance of 1698 miles to Tx. In order to reach our location in Tx within a time of 24 hours, what speed will we have to average? What speed will we have to travel in order to achieve the requested average? 1 solutions Answer 320876 by rfer(12662)   on 2011-07-06 13:29:18 (Show Source): You can put this solution on YOUR website!1698/24=70.75 mph
 Linear-equations/467448: Please help me with this algebra problem. Given the equation y=2/7x + 3, find the y coordinates of (-7) (0) and (7) please show work and if you can please plot the points and graph the linear equation. I just can not get this one!1 solutions Answer 320744 by rfer(12662)   on 2011-07-05 22:00:29 (Show Source): You can put this solution on YOUR website!y=2/7*-7+3 y=-2+3 y=1 (-2,1) ------------- y=2/7*0+3 y=3 (0,3) ------------ y=2/7*7+3 y=2+3 y=5 (7,5)
 Miscellaneous_Word_Problems/467428: In a mixture of concret there are two pounds of cement mix for each pound of gravel if the mixture contains a total of 93 pounds of these two ingredients how many pounds of gravel ate ther 1 solutions Answer 320738 by rfer(12662)   on 2011-07-05 21:20:41 (Show Source): You can put this solution on YOUR website!x+2x=93 3x=93 x=31# gravel 2x=62
 Numbers_Word_Problems/466960: the sum of two consecutive even number is 26 what are the two numbers? 1 solutions Answer 320359 by rfer(12662)   on 2011-07-04 15:15:18 (Show Source): You can put this solution on YOUR website!12+14=26
 Linear-systems/466968: i can't under stand if 3x+2y = -17 2x-5y = 14 the what is the process i can't under stand what i need is Ex: this i understand X+2y=5 y=2x X+2y=5 x+2(2x)= 5 x+4x=5 x+ 4= 5 5x and 5 divided by 5 y = 1 that i under stand but below i don't get it THIS!! Explanation: Solving: 3x+2y = -17 2x-5y = 14 Using Substitution Method. Expressing x as a function of y (from the first equation) x = (-17 -2y)/3 Substituting this expression into the second equation: 2(-17+2y)/3-5y = 14 Simplifying this expression: (-19)y = 76 or y = -4 Now, substituting y = -4 back into the x expressed as a function of y: x = (-17-2y)/3 = -3 1 solutions Answer 320358 by rfer(12662)   on 2011-07-04 15:13:53 (Show Source): You can put this solution on YOUR website!3x+2y=-17 2x-5y=14 2x=5y+14 x=2.5y+7 -------------- 3*(2.5y+7)+2y=-17 7.5y+21+2y=-17 9.5y=-38 y=-4 ----------------- 3x+2*-4=-17 3x-8=-17 3x=-9 x=-3 --------------- 2*-3-5*-4=14 -6+20=14
 Angles/466975: if the supplement of an angle is 10 less than thrice the complement of an angle, find the angle, its complement and supplement?1 solutions Answer 320353 by rfer(12662)   on 2011-07-04 15:01:36 (Show Source): You can put this solution on YOUR website!x+3x-10=90 4x=100 x=25 comp 3x-10=65 angle 180-65=115 sup
 Travel_Word_Problems/467017: Hello, I have a word problem on travel and distance. Two cars are 400 miles apart. Both start at the same time and travel toward one another. They meet 4 hours later. If the speed of one car is 20 miles per hour faster than the other, what is the speed of each car? Thank you1 solutions Answer 320350 by rfer(12662)   on 2011-07-04 14:55:44 (Show Source): You can put this solution on YOUR website!x+x+20=400/4 2x+20=100 2x=80 x=40 mph x+20=60 mph
 Geometric_formulas/466999: Hi I was hoping someone could help me with this problem! Thank you!! :) Express in set-builder notation. D = {5, 10, 15, 20,... } 1 solutions Answer 320348 by rfer(12662)   on 2011-07-04 14:53:49 (Show Source): You can put this solution on YOUR website!{D|D IS MULTIPLE OF 5 BETWEEN 5 AND INFINITY}
 Human-and-algebraic-language/467019: You invested 14,000 in two accounts paying 6% and 9% annual interest, respectively. If the total interest earned for the year \$900, how much was invested at each rate?1 solutions Answer 320347 by rfer(12662)   on 2011-07-04 14:51:38 (Show Source): You can put this solution on YOUR website!0.06x+0.09(14000-x)=900 0.06x+1260-0.09x=900 -0.03x=-360 x=\$12,000 at 6% 14000-12000=\$2,000 at 9%