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# Recent problems solved by 'rfer'

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 Percentage-and-ratio-word-problems/652388: While shopping, Barb spent four times as much as Jen. If they spent a total of 130, how much did each person spend?1 solutions Answer 407981 by rfer(12662)   on 2012-09-16 21:45:59 (Show Source): You can put this solution on YOUR website!5x=130 x=130/5 x=26 4x=104
 Volume/652330: how do you find the volume and area and volume of a triangle1 solutions Answer 407980 by rfer(12662)   on 2012-09-16 21:44:40 (Show Source): You can put this solution on YOUR website!A triangle does not have volume. A=(LH)/2
 Sequences-and-series/652390: 1/2t=-13 1 solutions Answer 407979 by rfer(12662)   on 2012-09-16 21:43:02 (Show Source): You can put this solution on YOUR website!t=-13/(1/2) t=-13*2/1 t=-26
 Complex_Numbers/652385: If gloria recieved a 12 percent raise and is now making \$24.640 a year, what was her salary before the raise? Round to the nearest dollar if necessary.1 solutions Answer 407976 by rfer(12662)   on 2012-09-16 21:27:53 (Show Source): You can put this solution on YOUR website!24650/1.12=\$22,009
 Geometry_Word_Problems/652328: If a regular pentagon is 89cm what is it in meters?1 solutions Answer 407975 by rfer(12662)   on 2012-09-16 21:25:51 (Show Source): You can put this solution on YOUR website!=0.89 meters
 Angles/652315: an angle is 81 more than twice its supplement1 solutions Answer 407973 by rfer(12662)   on 2012-09-16 21:23:52 (Show Source): You can put this solution on YOUR website!2x+81+x=180 3x=180-81 3x=99 x=33 2x+81=147
 Evaluation_Word_Problems/652374: two numbers have a sum of 44. the larger number is 8 more than the smaller. find the numbers.1 solutions Answer 407972 by rfer(12662)   on 2012-09-16 21:19:16 (Show Source): You can put this solution on YOUR website!x+8+x=44 2x=44-8 2x=36 x=36/2 x=18 x+8=26
 Expressions-with-variables/652346: what is 3/4a=2/81 solutions Answer 407971 by rfer(12662)   on 2012-09-16 21:17:30 (Show Source): You can put this solution on YOUR website!a=(2/8)/(3/4) a=2/8*4/3 a=8/24 a=1/3
 Money_Word_Problems/652373: A bakery has 250 lbs of flour. If they use 6% of the available flour each day, how much do they have after 15 days? Round to the nearest pound1 solutions Answer 407970 by rfer(12662)   on 2012-09-16 21:11:32 (Show Source): You can put this solution on YOUR website!250*0.06=15 lbs 15*15=225 lbs 250-225=25 lbs left
 Travel_Word_Problems/652283: suppose you drive from here to there at a speed of 30 miles/hour and then drive back from there to here at 60 miles/hour. what is your average speed?1 solutions Answer 407950 by rfer(12662)   on 2012-09-16 19:38:35 (Show Source): You can put this solution on YOUR website!(30+60)/2=45mph
 Inverses/652290: Can you explain y-(-6) = -74 1 solutions Answer 407949 by rfer(12662)   on 2012-09-16 19:37:19 (Show Source): You can put this solution on YOUR website!y+6=-74 y=-74-6 y=-80
 Average/652301: how do you do this problem? "78 is 30% of what number?"1 solutions Answer 407948 by rfer(12662)   on 2012-09-16 19:35:22 (Show Source): You can put this solution on YOUR website!divide 78/0.3=260
 Average/651980: kim had 78, 82, and 64 on her first three tests. What would be the lowest possible average on the next three exams so that Kim's grade in the class, based on the average of six exams, is a least 80? How can I set up an algebraic equation and please show you came to a solution.1 solutions Answer 407876 by rfer(12662)   on 2012-09-16 10:32:40 (Show Source): You can put this solution on YOUR website!(78+82+64+3x)/6=80 224+3x=80*6 224+3x=480 3x=480-224 3x=256 x=256/3 x=85.3
 Triangles/652023: what is the area of a right angled isosceles triangle if the two equal sides are of length 30?1 solutions Answer 407875 by rfer(12662)   on 2012-09-16 10:27:57 (Show Source): You can put this solution on YOUR website!A=(30*30)/2 A=450 sq units
 Exponents/651872: What is 2 to the power of 0 times 10 the power of the 01 solutions Answer 407847 by rfer(12662)   on 2012-09-15 21:35:15 (Show Source): You can put this solution on YOUR website!2^0*10^0=1*1=1
 Rectangles/651881: The length of a rectangle is 9 inches more than thr width. The perimeter is 54 inches. Find the length and width of the rectangle1 solutions Answer 407844 by rfer(12662)   on 2012-09-15 21:28:34 (Show Source): You can put this solution on YOUR website!54=2(x+9)+2x
 Travel_Word_Problems/651823: if a motorcycle traveled 55 miles in 5 hours, how many miles would the motorcycle have traveled per minute?1 solutions Answer 407831 by rfer(12662)   on 2012-09-15 19:17:15 (Show Source): You can put this solution on YOUR website!55/5=11 11/60=0.1833 mi/sec
 Money_Word_Problems/651761: Calculate the sales person's earning in one week if they sales were as follows: Monday \$1500.00 Tuesday\$3000.00 Wednesday\$970.00 Thursday\$4563.81 Friday\$2760.421 solutions Answer 407822 by rfer(12662)   on 2012-09-15 17:20:53 (Show Source): You can put this solution on YOUR website!What is the commission?
 Numbers_Word_Problems/651789: twice the sum of a number and 6 is the same as 3 more than the number. find the number1 solutions Answer 407821 by rfer(12662)   on 2012-09-15 17:18:40 (Show Source): You can put this solution on YOUR website!2(x+6)=x+3 2x+12=x+3 2x-x=3-12 x=-9 ------------------- 2(-9+6)=-9+3 -18+12=-6 -6=-6
 Travel_Word_Problems/651530: The distance between two plates is measured to be 0.453 cm. If the measuring instrament has an error range (tolerance) of 0.15%, what is the largest possible actual distance between these two plates? Do not round at all, place all decimal places in your answer.1 solutions Answer 407715 by rfer(12662)   on 2012-09-14 20:07:26 (Show Source): You can put this solution on YOUR website!0.453*1.0015=0.4536795 cm
 Travel_Word_Problems/651546: The school bus can get 4 miles per gallon of gas. How far can a school bus travel if it has 36 gallons of gas 1 solutions Answer 407714 by rfer(12662)   on 2012-09-14 20:04:40 (Show Source): You can put this solution on YOUR website!36*4=144 mi
 expressions/651558: I NEED HELP IN MATH 1 solutions Answer 407713 by rfer(12662)   on 2012-09-14 20:03:25 (Show Source): You can put this solution on YOUR website!post a problem
 Expressions-with-variables/651531: Translate to a system of equations and solve. The sum of two numbers is 8. Their difference is 12. Find the number. So far I have: x+y= 30 x-y= 12 I don't know what I have to do to solve for the numbers.1 solutions Answer 407695 by rfer(12662)   on 2012-09-14 18:40:10 (Show Source): You can put this solution on YOUR website!x+y=8 y=-x+8 x-y=12 x-(-x+8)=12 2x-8=12 2x=12+8 x=20/2 x=10 -------------- 10-y=12 -y=12-10 -y=2 y=-2 -------------- 10-2=8 I don't know where you got the 30 from.
 test/651472: 18=c+5/21 solutions Answer 407681 by rfer(12662)   on 2012-09-14 16:28:14 (Show Source): You can put this solution on YOUR website!5/2=2.5 18-2.5=c c=15.5
 Percentage-and-ratio-word-problems/651484: A coat was on sale for \$83.30. This was 85% of the original price. The original price of the coat was (A) \$100 (B) \$85 (C) \$83.30 (D) \$147 (E) None of the above P.S. i forgot how to do it so i need help1 solutions Answer 407680 by rfer(12662)   on 2012-09-14 16:26:51 (Show Source): You can put this solution on YOUR website!83.30/0.15=\$555.334 none of the above
 Percentage-and-ratio-word-problems/651493: Mary weighs 111 pounds. To the nearest percent, how much has she lost? (A) 3% (B) 3 1/2% (C) 4% (D) .04% (E) None of the above P.S. i don't get how to do it and i tried dividing 4/111 but it was a whole number and then a bunch of numbers after the decimal.1 solutions Answer 407679 by rfer(12662)   on 2012-09-14 16:23:13 (Show Source): You can put this solution on YOUR website!need more information
 Travel_Word_Problems/651404: A train leaves Little Rock, Arkansas, and travels north at 75 kilometers per hour. Another train leaves at the same time and travels south at 70 kilometers per hour. How long will it take before they are 580 kilometer apart? It will take ____ hours.1 solutions Answer 407657 by rfer(12662)   on 2012-09-14 13:15:02 (Show Source): You can put this solution on YOUR website!75+70=145 580/145=4 hrs
 Average/651253: 90% of what number is 631 solutions Answer 407589 by rfer(12662)   on 2012-09-13 23:27:48 (Show Source): You can put this solution on YOUR website!63/0.90=70
 Equations/651264: 3(j+1)=5(j-3) i don't know how to solve1 solutions Answer 407588 by rfer(12662)   on 2012-09-13 23:25:25 (Show Source): You can put this solution on YOUR website!3j+3=5j-15 3j-5j=-15-3 -2j=-18 j=-18/-2 j=+9
 Travel_Word_Problems/651268: whats -4+7x=31 solutions Answer 407587 by rfer(12662)   on 2012-09-13 23:23:28 (Show Source): You can put this solution on YOUR website!7x=3+4 7x=7 x=7/7 x=1
 Miscellaneous_Word_Problems/651237: at a restaurant alex order food that cost \$15.89. the tax on his bill was 8% he gave the waiter a 15% tip on the total bill, including tax write an expression that can be used to represent the tip alex left.1 solutions Answer 407584 by rfer(12662)   on 2012-09-13 22:36:10 (Show Source): You can put this solution on YOUR website!(15.89*1.08)(0.15)=\$2.57