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Recent problems solved by 'rfer'

 test/894102: 9÷3(6*4 ÷8 )= ? 1 solutions Answer 541835 by rfer(15570)   on 2014-08-21 17:33:16 (Show Source): You can put this solution on YOUR website! 9/3(6*4/8)= 9/3(3)= 3*3=9
 Angles/894188: find the measure of two complementary angles if the measure of one is 42 degrees more than twice the measure of the other. Solve. 1 solutions Answer 541834 by rfer(15570)   on 2014-08-21 17:30:53 (Show Source): You can put this solution on YOUR website! x+2x+42=90 3x=90-42 3x=48 x=48/3 x=16 2x+42=74
 Functions/894190: We are studying functions with maximums and minimums and i need to know weather y=3x^2 is a maximum or minimum and the vertex. 1 solutions Answer 541833 by rfer(15570)   on 2014-08-21 17:27:57 (Show Source): You can put this solution on YOUR website! The vertex is at the minimum (0,0)and opens up.
 percentage/893931: A tv cost \$600, a week later it was \$646. What is the percentage that the tv increased? 1 solutions Answer 541676 by rfer(15570)   on 2014-08-20 20:36:41 (Show Source): You can put this solution on YOUR website! 46/600=0.077=7.7%
 Geometry_Word_Problems/893974: Rate----what is 7.40 for 5 pounds 1 solutions Answer 541675 by rfer(15570)   on 2014-08-20 20:35:05 (Show Source): You can put this solution on YOUR website! 7.40/5=\$1.48 ea
 Inequalities/893748: Twice a number is atleast 15 Show work Write the inequality that represents the sentence 1 solutions Answer 541500 by rfer(15570)   on 2014-08-19 22:02:21 (Show Source): You can put this solution on YOUR website! 2x => 15
 Angles/893773: Find the measure of each angle. The measure of one angle is 20 less than the measure of its complement. 1 solutions Answer 541499 by rfer(15570)   on 2014-08-19 22:00:50 (Show Source): You can put this solution on YOUR website! x+x-20=90 2x=90+20 2x=110 x=110/2 x=55 x-20=35
 Travel_Word_Problems/893731: How long does a car traveling at 80 mph take to travel 110 miles, in hours? 1 solutions Answer 541463 by rfer(15570)   on 2014-08-19 17:03:43 (Show Source): You can put this solution on YOUR website! 110/80=1.375 hrs
 Equations/893732: how do i work this problem 3(5x+2)=15x? 1 solutions Answer 541462 by rfer(15570)   on 2014-08-19 17:02:55 (Show Source): You can put this solution on YOUR website! 3(5x+2)=15x 15x+6=15x 6=15x-15x no solution, x's cancel
 Travel_Word_Problems/893636: A train travells at a speed of 60 km/hr find the distance travelled by it in 20 min 1 solutions Answer 541461 by rfer(15570)   on 2014-08-19 17:01:28 (Show Source): You can put this solution on YOUR website! 60*20/60=20km
 test/893688: The length of a rectangle is 4 cm less than 3 times the width. if the perimeter is 88 cm, what are the dimensions of the rectangle? 1 solutions Answer 541460 by rfer(15570)   on 2014-08-19 16:57:38 (Show Source): You can put this solution on YOUR website! 2x+2(3x-4)=88
 percentage/893702: Sales = \$495. Cost = \$300. Express the profit as a percentage of sales 1 solutions Answer 541459 by rfer(15570)   on 2014-08-19 16:56:20 (Show Source): You can put this solution on YOUR website! 195/495=0.39=39%
 Inequalities/893718: -17=2a+9 1 solutions Answer 541458 by rfer(15570)   on 2014-08-19 16:53:56 (Show Source): You can put this solution on YOUR website! -17-9=2a -26/2=a -13=a
 Average/893724: I got 23 questions wrong out of 75 questions. What is my score 1 solutions Answer 541457 by rfer(15570)   on 2014-08-19 16:53:09 (Show Source): You can put this solution on YOUR website! 52/75=0.69=69%
 Mixture_Word_Problems/893486: By how much should a machinist decrease the length of a rod that is 4.78 cm long if the length must be within 0.02 cm and of 4.5 cm? 1 solutions Answer 541347 by rfer(15570)   on 2014-08-18 22:18:47 (Show Source): You can put this solution on YOUR website! 4.78-4.52=0.26 cm
 Percentage-and-ratio-word-problems/893496: There are 36 students in Mrs. Keaton's sixth grade class, If 5/12 of her students are girls, how many girls are in the class? 1 solutions Answer 541346 by rfer(15570)   on 2014-08-18 22:16:35 (Show Source): You can put this solution on YOUR website! 36*5/12=15
 Triangles/893521: A triangle has sides of 4 and 6 units. The measurement of the longest side is missing. Ted says that one possibility for the unknown side length is 11. Do you agree with Ted? Why or why not? 1 solutions Answer 541344 by rfer(15570)   on 2014-08-18 22:14:10 (Show Source): You can put this solution on YOUR website! no, a right triangle side would be 7.2
 Travel_Word_Problems/893531: Of the speed is 5 miles per hour how many feet will you travel on 12 minutes? 1 solutions Answer 541341 by rfer(15570)   on 2014-08-18 22:10:11 (Show Source): You can put this solution on YOUR website! 5*5280=26400 26400*12/60=5280 ft
 percentage/893535: Suppose that Jack scored 57 for his Chemistry test, which equates to 75%. How many marks were actually available in the Chemistry test? (Type the numerical value of your answer only) 1 solutions Answer 541337 by rfer(15570)   on 2014-08-18 22:06:07 (Show Source): You can put this solution on YOUR website! 57/0.75=76
 expressions/893541: Evaluate 5+4(2-5) to the 2 power + 3 1 solutions Answer 541335 by rfer(15570)   on 2014-08-18 22:04:03 (Show Source): You can put this solution on YOUR website! 5+4(2-5)^2+3= 5+4(-3)^2+3= 5+4*9+3= 5+36+3=44
 Miscellaneous_Word_Problems/893542: Hi can you please help me with this question? You can patch 108 boxes in 45 minutes. At this rate, how many boxes can you pack in 2 hours? 1 solutions Answer 541334 by rfer(15570)   on 2014-08-18 22:01:35 (Show Source): You can put this solution on YOUR website! 108/45=x/120 45x=120*108 45x=12960 x=12960/45 x=288
 Permutations/893406: Tom has 8 shirts, 3 pairs of jeans, and 4 pairs of tennis shoes. How many different outfits consisting of one shirt, 1 pair of jeans, and 1 pair of tennis shoes are possible? 1 solutions Answer 541306 by rfer(15570)   on 2014-08-18 17:03:04 (Show Source): You can put this solution on YOUR website! 8*3*4=96
 Rectangles/893433: The base of a rectangle is 20, which is twice its height. What part of the perimeter is the height? (A)1/12 (D)1/3 (B)1/6 (E)5/6 (C)1/4 1 solutions Answer 541305 by rfer(15570)   on 2014-08-18 17:01:49 (Show Source): You can put this solution on YOUR website! 20+20+10+10=60 10/60=1/6
 Signed-numbers/893476: on my summer math asigniment im stuk on this i dont get how to awnser it i clicked explain and still dont get it heres the problem Evaluate the following expression. [27 + 2 times (19-15)] divided by 5 plesee awnser some one 1 solutions Answer 541304 by rfer(15570)   on 2014-08-18 16:58:38 (Show Source): You can put this solution on YOUR website! [27+2(19-15)]/5= [27+8]/5 35/5=7
 Linear_Equations_And_Systems_Word_Problems/893483: please help me solve this equation Martha buys x apples and some oranges. She buys 3 more oranges than apples. Each apple costs .40 cents and each orange costs .50 cents. find, as simply as possible in terms of x, an expression for the total cost in dollars of the fruit that Martha buys. apples=x oranges= x + 3 1 solutions Answer 541303 by rfer(15570)   on 2014-08-18 16:55:40 (Show Source): You can put this solution on YOUR website! 0.40x+0.50(x+3)=
 expressions/893277: 10 times the sum of a number and 9 1 solutions Answer 541183 by rfer(15570)   on 2014-08-17 15:52:53 (Show Source): You can put this solution on YOUR website! 10(x+9)
 Average/893205: The mean of four numbers is 12. The mean of three of the numbers is 13. What is the fourth number? 1 solutions Answer 541169 by rfer(15570)   on 2014-08-17 13:23:02 (Show Source): You can put this solution on YOUR website! (13+13+13+x)/4=12 39+x=12*4 x=48-39 x=9
 test/893216: the sum of a number and 8 is less than 2 into a mathematical statement 1 solutions Answer 541166 by rfer(15570)   on 2014-08-17 13:19:09 (Show Source): You can put this solution on YOUR website! x+8 < 2
 Rectangles/893232: The perimeter of a rectangle is 24 inches. The length is twice the width. find the dimensions of the rectangle. 1 solutions Answer 541165 by rfer(15570)   on 2014-08-17 13:17:59 (Show Source): You can put this solution on YOUR website! 2x+2*2x=24 6x=24 x=4 2x=8
 Numbers_Word_Problems/893241: A minor league team plays 101 games, winning 14 more than twice as many games as they lost. How many games did they win? 1 solutions Answer 541164 by rfer(15570)   on 2014-08-17 13:16:44 (Show Source): You can put this solution on YOUR website! x+2x+14=101 3x=101-14 3x=87 x=29 2x+14=72 won
 percentage/893239: if the price of petrol decreased from R3.49 per litre to R3.43163 per litre, find the percentage decrease 1 solutions Answer 541163 by rfer(15570)   on 2014-08-17 13:14:41 (Show Source): You can put this solution on YOUR website! 3.49-3.43163=0.05837 0.05837/3.49=0.0167=1.67%