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# Recent problems solved by 'rfer'

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 Money_Word_Problems/261062: I need help setting up this problem please. Tickets to a recital cost \$2.00 for children, \$5.00 for adults and \$3.00 for seniors citizens. After the recital, the organizers find that 570 people attended, and \$1,950 was earned from ticket sales.However,they are unable to find a record of exactly how many children,adults,and senior citizens attended. All they can find is a cryptic note from the theater manager stating that three-fourths as many senior citizens as children attended1 solutions Answer 192326 by rfer(12678)   on 2010-01-25 21:14:14 (Show Source): You can put this solution on YOUR website!C+.75C+A=570 1.75C+A=570 A=570-1.75C ----------------- 2C+3(.75C)+5A=1950 -------------------- 2C+2.25C+5(570-1.75C) 2C+2.25C+2850-8.75C=1950 -4.5C=-900 C=225 Children .75C=169 Seniors A=176 Adults
 Linear-equations/261057: How do you change y+4=-3/4(x-1) to standard form?1 solutions Answer 192317 by rfer(12678)   on 2010-01-25 20:53:13 (Show Source): You can put this solution on YOUR website!y+4=-3/4(x-1) y+4=-3/4x+3/4 3/4x+y=3 1/4
 Evaluation_Word_Problems/261060: Find sqrt( 1-a^2)x b when a = 0.28 and b = 10 I tried sqrt( 1 - (0.28)^2) x 10 = 9.6 is that right?1 solutions Answer 192315 by rfer(12678)   on 2010-01-25 20:49:37 (Show Source): You can put this solution on YOUR website!That is what I get also. Bob
 Polynomials-and-rational-expressions/260971: 2x-3(x+5)= -3x+71 solutions Answer 192276 by rfer(12678)   on 2010-01-25 19:38:28 (Show Source): You can put this solution on YOUR website!2x-3(x+5)=-3x+7 2x-3x-15=-3x+7 2x=22 x=11
 Miscellaneous_Word_Problems/261000: A dealer bought some bikes for \$2,000. She sold them for \$2,400, making 50 dollars on each bike. How many bikes were involved?1 solutions Answer 192273 by rfer(12678)   on 2010-01-25 19:32:02 (Show Source): You can put this solution on YOUR website!2400-2000/50=8 bikes
 Linear-equations/260975: What is the slope of a line with the equation 4x + 12y = 6?1 solutions Answer 192265 by rfer(12678)   on 2010-01-25 19:21:48 (Show Source): You can put this solution on YOUR website!4x+12y=6 12y=-4x+6 y=-4/12x+6/12 y=-1/3x+1/2 slope=m=-1/3
 Linear-systems/260987: Help !! "solve each of the equations" -2x+3y =-9 y= ?????1 solutions Answer 192264 by rfer(12678)   on 2010-01-25 19:18:47 (Show Source): You can put this solution on YOUR website!-2x+3y=-9 3y=2x-9 y=2/3x-3
 Circles/260986: What is the approximate area of a fourth of a circle with a radius of six inches?1 solutions Answer 192260 by rfer(12678)   on 2010-01-25 19:15:41 (Show Source): You can put this solution on YOUR website!A=3.14*6^2*.25 A=28.26 sq in
 Rectangles/260985: The length of a rectangle is four times the width. the perimeter is ninety cm. what is the width and length.1 solutions Answer 192257 by rfer(12678)   on 2010-01-25 19:13:32 (Show Source): You can put this solution on YOUR website!90=2x+2(4x) 90=2x+8x 90=10x x=9 cm 4x=36 cm
 Inequalities/260984: my cousin is in 7th grade and i understand how to work a inequalitie such as x+5<20 . i just do not understand how to work one with a fraction and negitive sign in it such as (-1/3)x>30 . please help !1 solutions Answer 192254 by rfer(12678)   on 2010-01-25 19:11:47 (Show Source): You can put this solution on YOUR website!(-1/3)x >30 x > 30/(-1/3) x > 30*-3/1 x > -90
 Mixture_Word_Problems/260337: There are four times as many trumpets as flute players in the orchestra. If there are 70 trumpet and flute players, how many flutes players are there1 solutions Answer 191773 by rfer(12678)   on 2010-01-24 14:30:00 (Show Source): You can put this solution on YOUR website!x+4x=70 5x=70 x=14 flutes
 Numbers_Word_Problems/260346: the second of two numbrs is 8 more than the first. their sum is 20. find the two numbers1 solutions Answer 191771 by rfer(12678)   on 2010-01-24 14:27:24 (Show Source): You can put this solution on YOUR website!x+x+8=20 2x+8=20 2x=12 x=6 x+8=14
 Graphs/260131: Write the equation of the line with slope -9 and y intercept (0,4)1 solutions Answer 191582 by rfer(12678)   on 2010-01-23 20:42:33 (Show Source): You can put this solution on YOUR website!y=-9x+4
 Money_Word_Problems/260140: the suggested list price of a new car is \$34000. the dealer's cost is 85% of list. How much will you pay if the dealer is willing to accept \$100 over cost for the car?1 solutions Answer 191581 by rfer(12678)   on 2010-01-23 20:41:29 (Show Source): You can put this solution on YOUR website!34000*.85+100=\$29,000
 Linear_Algebra/259883: solve each linear equation using any technique name the technique 3x/4 + 6 = -121 solutions Answer 191376 by rfer(12678)   on 2010-01-22 21:29:11 (Show Source): You can put this solution on YOUR website!3x/4+6=-12 3x/4=-18 3x=-18*4 3x=-72 x=-24
 test/259917: 1/4 + 5/61 solutions Answer 191373 by rfer(12678)   on 2010-01-22 21:25:26 (Show Source): You can put this solution on YOUR website!1/4+5/6 3/12+10/12=13/12= 1 1/12
 Equations/259889: I am a parent that didn't get to finish in high school and my son has this problem and i don't know to write the equation out. thank you for your time. Here is the problem. Air Travel: A jet leaves the Chalotte, Noth Carolina, airport traveling at an aveage rate of 564 km/h. Another plane leaves the airport one half hour later traveling at 744 km/h in the same direction. Use an equation to find how long the second jet will take to overtake the first. 1 solutions Answer 191348 by rfer(12678)   on 2010-01-22 20:06:43 (Show Source): You can put this solution on YOUR website!overtake speed is 744-564=180 km/h A is 564/2=282km ahead 282/180=1.57 hrs or 1hr 34 min for B to overtake A
 Permutations/259811: A \$152,400 loan is taken out, at 11.5% for 25 years, for the purchase of a house. The loan requires monthly payments. Find the amount of each payment.1 solutions Answer 191347 by rfer(12678)   on 2010-01-22 20:02:25 (Show Source): You can put this solution on YOUR website!PMT=(L*i*(1+i)^300)/((1+i)^300-1) PMT=(152400*.115*(1.115)^300)/(1.115)^300-1
 Equations/259281: 4x+15 = 7x-61 solutions Answer 190896 by rfer(12678)   on 2010-01-21 12:48:18 (Show Source): You can put this solution on YOUR website!4x+15=7x-6 21=3x x=7
 Geometry_Word_Problems/259108: A tree cast a shadow 60 Feet long. At the same time, an 8-foot post casts a 12-foot shadow. How tall is the tree1 solutions Answer 190812 by rfer(12678)   on 2010-01-21 01:16:41 (Show Source): You can put this solution on YOUR website!60/x=12/8 12x=480 x= 40 ft tall
 Geometry_Word_Problems/259112: A Flagpole casts a 75-foot shadow at the same time a tree 20 feet tall casts a shadow of 30 feet. How tall is the flagpole1 solutions Answer 190811 by rfer(12678)   on 2010-01-21 01:14:14 (Show Source): You can put this solution on YOUR website!20/30=x/75 30x=1500 x=50 ft tall
 Geometry_Word_Problems/259113: A local monument casts a shadow 111 feet long at the same time a 50-foot telephone pole casts a shadow 10 feet long. How high is the monument?1 solutions Answer 190810 by rfer(12678)   on 2010-01-21 01:12:17 (Show Source): You can put this solution on YOUR website!50/10=x/111 10x=5550 x=555 ft high
 Finance/259135: Ben is making wooden toys for the next arts and crafts sale. Each toy costs Ben \$1.80 to make. If he sells the toys for \$3.00 each, how many will he have to sell to make a profit of exactly \$36.00 ? A. 12 B. 20 C. 30 D. 60 E. 108 1 solutions Answer 190809 by rfer(12678)   on 2010-01-21 01:08:27 (Show Source): You can put this solution on YOUR website!3-1.8=1.2 36/1.2=30 Answer C
 expressions/259137: -3/4 x -1/3 + 7/8 x -1/21 solutions Answer 190808 by rfer(12678)   on 2010-01-21 01:05:17 (Show Source): You can put this solution on YOUR website!-3/4x-1/3+7/8x-1/2 -6/8x-2/6+7/8x-3/6 1/8x-5/6 find common denominators then combine like terms
 Functions/259163: My question is in regards to graphing linear functions. I need to graph y=2/3x-4 I am unsure how to graph it. Could you also explain why I graph it the way I do based on that formula. Thanks a lot. ANy help is appreciated.1 solutions Answer 190807 by rfer(12678)   on 2010-01-21 01:01:53 (Show Source): You can put this solution on YOUR website!you have a slope intercept equation y=mx+b y=2/3x-4 y int= -4 (0,-4) m=slope=2/3 the rise over the run so next point is (3,-2)
 Numeric_Fractions/259144: First Question: 7/14 + 3/14 + 8/14= Second Question: 4 1/2 - 8 1/5= 1 solutions Answer 190806 by rfer(12678)   on 2010-01-21 00:58:27 (Show Source): You can put this solution on YOUR website!1) 7/14+3/14+8/14=18/14=1 2/7 2) 4 1/2-8 1/5 45/10-82/10= -37/10= -3 7/10
 absolute-value/259146: nate runs 8miles each week. Write an expression for the number of miles he runs in n weeks. Find the number of miles nate runs in 5 weeks? 1 solutions Answer 190805 by rfer(12678)   on 2010-01-21 00:53:44 (Show Source): You can put this solution on YOUR website!D=r*n D=8*5 D=40 miles
 Travel_Word_Problems/259150: it is a 42 km drive go oakdale to ridgemont and takes 28 min. Because of traffic and construction working the trip is now 14 minutes longer. find the reduced speed limit in km/h1 solutions Answer 190804 by rfer(12678)   on 2010-01-21 00:51:45 (Show Source): You can put this solution on YOUR website!r=D/t r=42/.07 hrs r=60 km/h
 Travel_Word_Problems/259156: Jim drives to Hermiston at 80mph. If Hermiston is 30 miles away how long does it take to get there (in hours)?1 solutions Answer 190803 by rfer(12678)   on 2010-01-21 00:46:24 (Show Source): You can put this solution on YOUR website!t=D/r t=30/80 t=0.375 hrs or 22.5 min
 Travel_Word_Problems/259159: If you drive 315 miles in 6 hours, how long will it take you to drive an additional 85 miles at the same rate of speed?1 solutions Answer 190801 by rfer(12678)   on 2010-01-21 00:42:29 (Show Source): You can put this solution on YOUR website!315/6=85/x 315x=510 x=510/315 x=1.6 hrs or 1 hr 36 min
 Equations/259160: solve the equation 7x+2=23? and 12-5x=161 solutions Answer 190800 by rfer(12678)   on 2010-01-21 00:39:56 (Show Source): You can put this solution on YOUR website!7x+2=23 7x=21 x=3 ------------- 12-5x=16 -5x=4 x=-4/5