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# Recent problems solved by 'rfer'

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 real-numbers/315841: what number is 129 less than twice 78? a boy's step is 1.6dm long. how many steps will it take him to cover 500m distance? if 12:7=8:n, what is n the sum of 2 numbers is 76 while the difference is 8. find the smaller number.1 solutions Answer 225954 by rfer(12644)   on 2010-06-19 23:23:01 (Show Source): You can put this solution on YOUR website!A) 27 B) 500/1.6=312.5 steps C) x+x+8=76 2x=68 x=34 x+8=42
 Expressions-with-variables/315811: v/R = nT/p solve for R1 solutions Answer 225945 by rfer(12644)   on 2010-06-19 21:35:56 (Show Source): You can put this solution on YOUR website!R=(nT/p)/v
 Expressions-with-variables/315766: The expression πr2 gives the area of a circle with radius r. How many square meters of wheat were destroyed when an alien ship made a crop circle of diameter 25 meters in the wheat field at the Southwind Ranch? 1 solutions Answer 225944 by rfer(12644)   on 2010-06-19 21:34:46 (Show Source): You can put this solution on YOUR website!3.14*12.5^2=A A=490.625 sq meters
 Miscellaneous_Word_Problems/315796: A broadway theater has 600 seats, divided into orchestra, main, and balcony seating. Orchestra seats sell for \$50, main for \$35, and balcony for \$25. If all the seats are sold, the gross revenue is \$20,800. If all of the main and balcony seats are sold, but only half the orchestra seats are sold, the gross revenue is \$17,800. How many are there of each kind of seat?1 solutions Answer 225939 by rfer(12644)   on 2010-06-19 21:23:16 (Show Source): You can put this solution on YOUR website!6000/50=120 orchestra m+b=480 b=480-m 35m+25b=14800 35m+25(480-m=14800 35m+12000-25m=14800 10m=2800 m=280 main balcony = 200
 Miscellaneous_Word_Problems/315779: A church seeple casts a shadow 115 ft long, and at the same time a 9.0 ft post cast a shadow 7.0 ft long.How high is the steeple? Round to the nearest unit.1 solutions Answer 225921 by rfer(12644)   on 2010-06-19 17:34:49 (Show Source): You can put this solution on YOUR website!9/7=x/115 7x=1035 x=148 ft
 Proportions/315781: A recipe calls for 2.8 cups of milk for every 6 cups of flour. how much milk would be required for 5.5 cups of flour. write a proportion you would use to solve. 1 solutions Answer 225919 by rfer(12644)   on 2010-06-19 17:33:00 (Show Source): You can put this solution on YOUR website!2.8/6=x/5.5 6x=15.4 x=2.57 cups
 Geometry_Word_Problems/315679: perimeter of a rectangle is 112 inches the length exceeds the width by 4 inches find the length and width1 solutions Answer 225913 by rfer(12644)   on 2010-06-19 16:35:30 (Show Source): You can put this solution on YOUR website!2x+2(x+4)=112 4x+8=112 4x=104 x=26 x+4=30
 Miscellaneous_Word_Problems/315714: sum of two numbers is 26. the largest number is 2 less than 3 times the smallest number. what is the smallest number 1 solutions Answer 225912 by rfer(12644)   on 2010-06-19 16:29:40 (Show Source): You can put this solution on YOUR website!x+3x-2=26 4x=28 x=7 3x-2=19
 Rectangles/315685: Find the length and the width of a rectangle if the perimeter is 20ft and the length is four time the width. 1 solutions Answer 225911 by rfer(12644)   on 2010-06-19 16:28:03 (Show Source): You can put this solution on YOUR website!2x+2(4x)=20 10x=20 x=2 4x=8
 Linear-equations/315763: I need to find the equation when im given the point and slope intercept 0,0 m=2/31 solutions Answer 225909 by rfer(12644)   on 2010-06-19 16:24:51 (Show Source): You can put this solution on YOUR website!y=2/3x
 Linear-equations/315769: find the slope of the line 3x + 5y = -11 solutions Answer 225908 by rfer(12644)   on 2010-06-19 16:23:16 (Show Source): You can put this solution on YOUR website!3x+5y=-1 5y=-3x-1 y=-3/5x-1 m=-3/5
 Inequalities/315559: Simplify and graph 6y < 18. 1 solutions Answer 225815 by rfer(12644)   on 2010-06-18 18:54:25 (Show Source): You can put this solution on YOUR website!y < 3
 Miscellaneous_Word_Problems/315610: Ticket sales. Tickets for a concert were sold to adults for \$3 and to students for \$2. If the total receipts were \$824 and twice as many adult tickets as student tickets were sold, then how many of each were sold?1 solutions Answer 225813 by rfer(12644)   on 2010-06-18 18:52:42 (Show Source): You can put this solution on YOUR website!3(2x)+2x=824 8x=824 x=103 stdents 2x=206 adults ---------------- 3(206)+2*103=824 618+206=824
 Travel_Word_Problems/315389: What is the distance traveled at a speed of 60km per hour, for 2hours?1 solutions Answer 225662 by rfer(12644)   on 2010-06-17 21:25:00 (Show Source): You can put this solution on YOUR website!60*2=120 km
 Mixture_Word_Problems/315318: A contractor estimated that 30 ft^3 of cement is required to make a concrete floor that measure 90 ft^2. Using this estimate, how much cement is required to make a concrete floor that measures 120ft^2?1 solutions Answer 225661 by rfer(12644)   on 2010-06-17 21:24:19 (Show Source): You can put this solution on YOUR website!30/90=x/120 90x=3600 x=40 cu ft
 Expressions-with-variables/315326: Fun Land theme park has a total of 110 males and females who are employed at the park. If the number of males is 10 more than three times the number of females, how many males are employed at the park?1 solutions Answer 225660 by rfer(12644)   on 2010-06-17 21:21:09 (Show Source): You can put this solution on YOUR website!3x+10+x=110 4x=100 x=25 females 3x+10=85 males
 Expressions-with-variables/315325: x - y = 10 2x + y = 2 SOLVE FOR X&Y1 solutions Answer 225659 by rfer(12644)   on 2010-06-17 21:19:07 (Show Source): You can put this solution on YOUR website!x-y=10 x=y+10 2x+y=2 2(y+10)+y=2 2y+20+y=2 3y=-18 y=-6 --------------------- 2x+-6=2 2x=8 x=4 ----------------- 4-(-6)=10
 Numeric_Fractions/315351: Six workers worked 14 days and complete 80%of the work. How many days did it take to do the whole job?1 solutions Answer 225657 by rfer(12644)   on 2010-06-17 21:14:51 (Show Source): You can put this solution on YOUR website!14/.8=17.5 days
 Graphs/315354: Give an equation that is slope m=4 and Y intercept of b=-31 solutions Answer 225655 by rfer(12644)   on 2010-06-17 21:13:31 (Show Source): You can put this solution on YOUR website!y=4x-3
 Expressions-with-variables/315361: How would you write the equation: One added to three times a number is three less than four times the number. 1 solutions Answer 225654 by rfer(12644)   on 2010-06-17 21:12:38 (Show Source): You can put this solution on YOUR website!3x+1=4x-3
 test/315368: -8=h/6-31 solutions Answer 225653 by rfer(12644)   on 2010-06-17 21:10:15 (Show Source): You can put this solution on YOUR website!-8=h/6-3 -5=h/6 -5/6=h
 Coordinate-system/315386: hahhaha ! help me in mathhhhhhhh ! 1 solutions Answer 225651 by rfer(12644)   on 2010-06-17 21:07:23 (Show Source):
 Mixture_Word_Problems/315387: John is traveling to a meeting that is 28 miles away. He needs to be there in 30 minutes. How fast does he need to go to make it to the meeting on time?1 solutions Answer 225650 by rfer(12644)   on 2010-06-17 21:07:03 (Show Source): You can put this solution on YOUR website!56 mph
 Angles/314990: It measure is 50 less than its supplement? Its measure is 30 more twice that of its complement? solve for X 8/12 = x/15 1 solutions Answer 225398 by rfer(12644)   on 2010-06-16 23:25:16 (Show Source): You can put this solution on YOUR website!8/12=x/15 12x=120 x=10
 Trigonometry-basics/314997: I have a hypotnuse of 20 and I have an adjacent of 12.The opposite is unknown.I know I have to use cos, but I'm still unsure of how to solve for this. 1 solutions Answer 225396 by rfer(12644)   on 2010-06-16 23:21:50 (Show Source): You can put this solution on YOUR website!c^2-a^2=b^2 400-144=256 sq rt 256=16
 Parallelograms/315015: 1- for trapezoid DEFG, T and U are midpoints of the legs. Find TU and m in the problem it is given that 2- The blueprint for a swimming pool is 8 inches by 2 1/2 inches. The actual pool is 136 feet long. Find the width of the pool. 1 solutions Answer 225393 by rfer(12644)   on 2010-06-16 23:18:28 (Show Source): You can put this solution on YOUR website!8/136=2.5/x 8x=340 x=42.5 ft
 Evaluation_Word_Problems/315073: An astronaut who weighs 135 pounds on Earth would weigh 35 pounds on the Theta Space Station. If a piece of equipment weighed 2160 pounds on Earth, what would it weigh on Theta Space Station?1 solutions Answer 225390 by rfer(12644)   on 2010-06-16 23:12:34 (Show Source): You can put this solution on YOUR website!135/35=2160/x 135x=75600 x=560 lbs
 Miscellaneous_Word_Problems/315080: A high school graduating class is made of 365 students. There are 111 more girls than boys. How many boys are in the class? Pleas show me step by step the process of the problem.1 solutions Answer 225389 by rfer(12644)   on 2010-06-16 23:11:00 (Show Source): You can put this solution on YOUR website!x+x+111=365 2x=254 x=127 boys x+111=238 girls
 Rectangles/315083: the length of a rectangle is 4ft longer than twice the width. the perimeter of the rectangle is 56 ft. draw a rectangle. find its length and width using the perimeter formula. then use the formula to find its area1 solutions Answer 225387 by rfer(12644)   on 2010-06-16 23:09:03 (Show Source): You can put this solution on YOUR website!2x+2(2x+4)=56 2x+4x+8=56 6x=48 x=8 2x+4=20 ------------- 8*20=160 sq ft
 Equations/315084: 17-(-8)-4+6 I need to find the solution and know how to work the problem out!1 solutions Answer 225382 by rfer(12644)   on 2010-06-16 23:04:52 (Show Source): You can put this solution on YOUR website!17-(-8)-4+6 17+8-4+6=27 ----------- look at -(-8) as -1*-8=+8 - times a - = a plus
 Equations/314809: 1/5(x+3)-4=1/2(x+7)1 solutions Answer 225248 by rfer(12644)   on 2010-06-16 13:46:56 (Show Source): You can put this solution on YOUR website!1/5(x+3)-4=1/2(x+7) 1/5x+1/5*3-4=1/2x+1/2*7 -3/5x+3/5-4=7/2 -3/5x+3/5-20/5=7/2 -3/5x-17/5=7/2 -3/5x=7/2+17/5 -3/5x=35/10+34/10 -3/5x=69/10 x=69/10*-5/3 x=-345/30 x=-11.5 or -11 1/2