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# Recent problems solved by 'rfer'

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 Linear-systems/363299: how do you solve x-4/7=7x-5/21??1 solutions Answer 259020 by rfer(12660)   on 2010-10-28 18:42:54 (Show Source): You can put this solution on YOUR website!x-4/7=7x-5/21 -6x=-5/21+4/7 -6x=-5/21+12/21 -6x=7/21 x=7/21*-1/6 x=-7/126 x=-1/18
 Linear_Equations_And_Systems_Word_Problems/363097: If I used 27,000 gallons of gas at \$3.00 per gallon how many miles did I drive1 solutions Answer 258963 by rfer(12660)   on 2010-10-28 16:30:03 (Show Source): You can put this solution on YOUR website!I will guess with you.
 Numbers_Word_Problems/363104: The sum of two numbers is greater than or equal to 28. The second number is 8 less than the first. What are the values. denote the firts nubmer by x1 solutions Answer 258961 by rfer(12660)   on 2010-10-28 16:28:13 (Show Source): You can put this solution on YOUR website!x+x-8=>28 2x=>36 x=>18 x-8=>10
 Volume/362703: please help me solve this problem and show me how to write the equation: find the volume of a cylinder with a height of 6 inches and a radius of 1.5 inches thank you1 solutions Answer 258654 by rfer(12660)   on 2010-10-27 21:04:30 (Show Source): You can put this solution on YOUR website!V=pi*r^2*h V=3.14*1.5^2*6 V=42.39 cu in
 Equations/362859: 4n+9=611 solutions Answer 258651 by rfer(12660)   on 2010-10-27 21:00:56 (Show Source): You can put this solution on YOUR website!4n=52 n=13
 Money_Word_Problems/362864: Mr. Brittern's income from two stocks each year totals \$280. Stock A pays dividends at the rate of 5% and Stock B at the rate 6%. If he has invested a total of \$5000, how much capital is invested in each stock?1 solutions Answer 258647 by rfer(12660)   on 2010-10-27 20:59:19 (Show Source): You can put this solution on YOUR website!0.05x+0.06(5000-x)=280 0.05x+300-0.06x=280 -0.01x=-20 x=2000 5000-x=3000
 Travel_Word_Problems/362689: A sample of 150 flash drives contained 7 defective drives. How many defective flash drives would you expect in a batch of 2700 flash drives. 1 solutions Answer 258610 by rfer(12660)   on 2010-10-27 19:54:42 (Show Source): You can put this solution on YOUR website!7/150=x/2700 150x=18900 x=126
 Geometry_Word_Problems/362692: a family room measures 18 feet 6 inches by 15 feet 4 inches. find the approximate area in square feet1 solutions Answer 258608 by rfer(12660)   on 2010-10-27 19:53:06 (Show Source): You can put this solution on YOUR website!18.5*15.33=284 sq ft
 Linear-equations/362748: can you put the following linear equation in slope intercept form:2x-5y=20 can you Solve for x in the following inequality: -17 < -2x + 3 < or equal to 25? can you find the solution to what x is? 8 - x - 4 < 5 1 solutions Answer 258601 by rfer(12660)   on 2010-10-27 19:48:41 (Show Source): You can put this solution on YOUR website!2x-5y=20 -5y=-2x+20 y=2/5x-4 ------------ x > -1
 Equations/362730: how do i solve this problem :1.03-4 = -2.15p+8.72...... thanks1 solutions Answer 258600 by rfer(12660)   on 2010-10-27 19:47:09 (Show Source): You can put this solution on YOUR website!-2.97=-2.15p+8.72 2.15x=11.69 x=5.44
 Geometry_Word_Problems/362669: A restaurant has a dining room that is 62 ft by 55 ft. What is the area of the dining room? What is the perimeter of the dining room?1 solutions Answer 258480 by rfer(12660)   on 2010-10-27 16:51:56 (Show Source): You can put this solution on YOUR website!A=62*55 A=3410 sq ft ------ P=2*62+2*55 P=124+110 P=234 ft
 Equations/362626: I need a equation and slope of the line problem, like 8x+4y=12. I only need one more. Thanks1 solutions Answer 258477 by rfer(12660)   on 2010-10-27 16:49:52 (Show Source): You can put this solution on YOUR website!4y=-8x+12 y=-2x+3 y int =3 (0,3) Slope m=-2
 Graphs/362642: 6y+5x=-18 Graph the equation and identify the y intersection.1 solutions Answer 258476 by rfer(12660)   on 2010-10-27 16:47:53 (Show Source): You can put this solution on YOUR website!6y=-5x-18 y=-5/6-3 y int=-3 (0,-3)
 Graphs/362647: (-9,-5)(-12,-7) Find slope if it exists1 solutions Answer 258471 by rfer(12660)   on 2010-10-27 16:45:06 (Show Source): You can put this solution on YOUR website!slope m=2/3
 Graphs/362649: y=x+2 Graph the equation and identify the y intercept.1 solutions Answer 258468 by rfer(12660)   on 2010-10-27 16:41:24 (Show Source): You can put this solution on YOUR website!y int=2 (0,2)
 Probability-and-statistics/362637: Julie walked 6 times as far as sylvia. If Sylvia walked 5 km, then how far did Julie walk?1 solutions Answer 258466 by rfer(12660)   on 2010-10-27 16:40:17 (Show Source): You can put this solution on YOUR website!5*6=30 km
 Graphs/362648: x+9y=18 Find slope if it exists.1 solutions Answer 258465 by rfer(12660)   on 2010-10-27 16:38:38 (Show Source): You can put this solution on YOUR website!9y=-x+18 y=-1/9x+2 slope m = -1/9
 Inequalities/362650: 3/2+3/4a=1/4a-1/2 I need to know how to solve this problem. thank you 1 solutions Answer 258462 by rfer(12660)   on 2010-10-27 16:37:19 (Show Source): You can put this solution on YOUR website!1/2a=-2 a=-1
 Quadratic_Equations/362659: -14=6x-8(x+3) 1 solutions Answer 258461 by rfer(12660)   on 2010-10-27 16:35:21 (Show Source): You can put this solution on YOUR website!-14=6x-8x-24 2x=-10 x=-5
 Linear-equations/362334: find the coordinates of the x intercept and the y intercept of this linear equation 3x-4y=241 solutions Answer 258193 by rfer(12660)   on 2010-10-26 21:38:00 (Show Source): You can put this solution on YOUR website!3x-4y=24 3x-4*0=24 x=8 (8,0) 3*0-4y=24 y=-6 (0,-6)
 Average/362291: ho to solve problem if a student has grades of 70 and 90 on first two test and they want an average of at least 74 what possible scores can she make on her thrid test1 solutions Answer 258185 by rfer(12660)   on 2010-10-26 21:13:41 (Show Source): You can put this solution on YOUR website!(70+90+x)/3=74 (160+x)/3=74 160+x=74*3 160+x=222 x=62
 Linear-systems/362314: For the following problem, the slope and one point on a line are given. Use the point-slope form to find the equation of the line. (Write your answers in slope-intercept form.) (-8,-1), m = -1/41 solutions Answer 258182 by rfer(12660)   on 2010-10-26 21:10:20 (Show Source): You can put this solution on YOUR website!y=-1/4x-3
 Expressions-with-variables/362313: 1/4(k-1)=71 solutions Answer 258181 by rfer(12660)   on 2010-10-26 21:08:40 (Show Source): You can put this solution on YOUR website!1/4k-1/4=7 1/4k=7 1/4 k=29/4*4/1 k=116/4 k=29
 Triangles/362059: The angle of elevation of a building from a point on the ground 200 feet away from its base is 42 degrees. Find the height of the building to the nearest foot. A. 180 feet B. 187 feet C. 195 feet D. 200 feet E. 206 feet 1 solutions Answer 258060 by rfer(12660)   on 2010-10-26 15:20:20 (Show Source): You can put this solution on YOUR website!tan42*200=180 ft
 Surface-area/362016: Amanda made a circular tabletop that has an area of 452 sq in. Which is closest to the radius of the tabletop? Choose one answer. a. 9 in b. 12 in c. 24 in d. 72 in 1 solutions Answer 258031 by rfer(12660)   on 2010-10-26 13:35:59 (Show Source): You can put this solution on YOUR website!(B) 12
 Money_Word_Problems/361990: You wish to have \$17,000 in 11 years. Find how much you should invest now at 12% interest, compounded quarterly in order to have \$17,000, 11 years from now. Then calculate the amount of interest.1 solutions Answer 258029 by rfer(12660)   on 2010-10-26 13:34:35 (Show Source): You can put this solution on YOUR website!17000=P(1+.12/4)^44 17000=P*3.671 P=17000/3.671 P=4631 ----------------- 17000-4631=12,369 interest