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 Quadratic_Equations/518331: 3x^4-31x^2+28 SOLVE1 solutions Answer 345126 by richwmiller(9143)   on 2011-10-20 08:36:29 (Show Source): You can put this solution on YOUR website!There is nothing to solve. Equations are solved. There is no equal sign therefore there is no equation.
 Travel_Word_Problems/518333: The Yankee Clipper leaves the pier at 9:00 a.m. at 8 knots. A half hour later , The River Rover leaves the same pier in the same direction traveling 10 knots . At what time will the River Rover overtake the Yankee Clipper? 1 solutions Answer 345125 by richwmiller(9143)   on 2011-10-20 08:32:58 (Show Source): You can put this solution on YOUR website!r*t=d 8t=10*(t-.5) 8t=10t-5 5=2t 2.5=t They will meet at 11:30 am
 Money_Word_Problems/518341: At the central Perk coffee shop, Destiny sold 30 more cups of cappuccino than expresso, for a total of 178.50 worth of expresso and cappuccino. How many cups of each were sold if expresso cost 2.00 per cup and cappuccino cost 2.50 per cup?1 solutions Answer 345124 by richwmiller(9143)   on 2011-10-20 08:27:58 (Show Source): You can put this solution on YOUR website!2e+2.5c=178.5 e+30=c 2e+2.5(e+30)=178.5 2e+2.5e+2.5*30=178.5 4.5e+75=178.5 4.5e=103.5 e=103.5/4.5 e=23 c=53 check 46+2.5*53=178.5 2.5*53=132.5 106+26.5=132.5 ok
 Numbers_Word_Problems/518342: twice a number decreased by 8 is 261 solutions Answer 345123 by richwmiller(9143)   on 2011-10-20 08:20:00 (Show Source): You can put this solution on YOUR website!2x-8=26
 Permutations/518160: A computer lab has 10 computers. How many ways can the computers be assigned to a group of 15 students?1 solutions Answer 345100 by richwmiller(9143)   on 2011-10-19 22:58:14 (Show Source): You can put this solution on YOUR website!any of the 15 could go to the first computer now there are 14 any of the 14 could go to the second computer etc 5 can go to the 10 th computer 15*14*13*12*11*10*9*8*7*6*5
 Mixture_Word_Problems/518228: Could you please help me solve this word problem?: You are given \$3.45 in change, however the cash register only has dimes and quarters. You receive a total of 15 coins back. How many dimes do you receive?1 solutions Answer 345099 by richwmiller(9143)   on 2011-10-19 22:52:56 (Show Source): You can put this solution on YOUR website!d+q=15 10d+25q=345
 Mixture_Word_Problems/518226: I need help with a word problem on my assignment: A nut wholesaler sells cashews for \$3.50 a pound, and peanuts for \$2 a pound. If he was going to create a 60 pound mixture to sell for \$3 a pound, how many cups of each type of nuts would he need?1 solutions Answer 345098 by richwmiller(9143)   on 2011-10-19 22:50:51 (Show Source): You can put this solution on YOUR website!3.5c+2p=60*3 c+p=60 c=40 p=20
 Numbers_Word_Problems/518205: The sum of two numbers is 17 and their different is 91 solutions Answer 345097 by richwmiller(9143)   on 2011-10-19 22:47:14 (Show Source): You can put this solution on YOUR website!x+y=17 x-y=9 add 2x=26 x=13 13+y=17 y=4
 Rational-functions/518161: PLEASE be so kind as to help with this. w + x + y + z= 7 2w -x + y -z = -10 w + x -2y + z = 16 -w + x -y + 2z = 151 solutions Answer 345096 by richwmiller(9143)   on 2011-10-19 22:44:26 (Show Source): You can put this solution on YOUR website!w = 1, x = 5, y = -3, z = 4
 Quadratic_Equations/518209: A swimming pool 6m wide and 10m long is to be surrounded by a cement path of uniform width. The area of the walk is equal to the area of the pool. What is the width of the path?1 solutions Answer 345092 by richwmiller(9143)   on 2011-10-19 22:36:39 (Show Source): You can put this solution on YOUR website!area of the pool is 60 m^2 area of the walk is 60 m^2 (6+x)*(10+x)=120 x^2+16x+60 = 120 solve for x unfortunately the x's are not integers. x=3.13553
 Polynomials-and-rational-expressions/518050: Is this equation correct: (xy)³ = xy³ ? Explain why. If it is correct, how can you prove this? If it is incorrect, what should be done to make it right?1 solutions Answer 345023 by richwmiller(9143)   on 2011-10-19 19:11:08 (Show Source): You can put this solution on YOUR website!It depends on the value of x and y. In general, the left side will not equal to the right side. left side says to multiply x and y and then cube it. right side says to cube y and then multiply by x take some examples let x=2 and y=3 6^3= 6*36=2*3^3 6*36=2*3*3*3 6*36=6*9 which is obviously not true. to make it correct you must make the left side equal the right side.
 Mixture_Word_Problems/518029: How much water must be added to 300 L of a solution so that its concentration may change from 25% to 20%?1 solutions Answer 345021 by richwmiller(9143)   on 2011-10-19 18:56:08 (Show Source): You can put this solution on YOUR website!from the point of view of the water .75*300+x=.80*(300+x) x=75 add 75 liters of water
 Expressions-with-variables/517815: how do i solve for: 7a,for a = 4651 solutions Answer 344938 by richwmiller(9143)   on 2011-10-19 13:18:25 (Show Source): You can put this solution on YOUR website!7*465
 Travel_Word_Problems/517790: two trains leave stations 224 miles apart at the same time and travel toward each other. one train travels at 80 miles per hour while the other travels at 60 miles per hour. how long will it take for the two trains to meet?1 solutions Answer 344934 by richwmiller(9143)   on 2011-10-19 13:02:41 (Show Source): You can put this solution on YOUR website!60t+80t=224 140t=224 t=224/140 t=1.6 hrs t=1 3/5 hrs t=1 hour 36 minutes
 Quadratic_Equations/517797: B will take 3 days longer than A to complete a piece of work. If they together can complete the work in two days. Find the time each alone will take to complete the work. 1 solutions Answer 344931 by richwmiller(9143)   on 2011-10-19 12:53:04 (Show Source): You can put this solution on YOUR website! b=a+3 (2/a)+(2/(a+3))=1 a=3 b=6 check 2/3+2/6=1 2/3+1/3=1 1=1 ok
 Travel_Word_Problems/517798: Anne walked 3.2 kilometers. How many meters did Anne walk?1 solutions Answer 344924 by richwmiller(9143)   on 2011-10-19 12:43:43 (Show Source): You can put this solution on YOUR website! 3.2*1000= 3200
 Geometry_Word_Problems/517791: A rectangular swimming pool 10 feet by 28 feet is surrounded by a concrete walkway of uniform width of X feet. If the area of the walkway is 864 square feet, find the width of the walkway.1 solutions Answer 344923 by richwmiller(9143)   on 2011-10-19 12:41:49 (Show Source): You can put this solution on YOUR website!The pool has an area of 280 sq ft. (10+x)*(28+x)=280+864=1144 (10+x)*(28+x)=1144 x^2+38x+280 = 1144 x^2+38x-864 = 0 x=-54, x=16 walkway is 16 ft wide check 26*44=1144 ok
 Linear-equations/517759: I have two kids i need to get to school.Both start at 7:50. One takes the bus the other I drive to school. I need to take the first one early so i can make it back to my second to catch the bus on time by 7:301 solutions Answer 344920 by richwmiller(9143)   on 2011-10-19 12:25:36 (Show Source): You can put this solution on YOUR website!That's nice. Have the other one take a bus too.
 Travel_Word_Problems/517775: a Tour bus leaves Sacramento every Friday evening at 5 pm for a 170 mile trip. this week however the bus leaves at 5:30 pm. to arrive on time , the driver drives 9 miles per hour faster than usual what is the buses usual speed? please show work1 solutions Answer 344917 by richwmiller(9143)   on 2011-10-19 12:17:30 (Show Source): You can put this solution on YOUR website!r*t=d r*t=170 (r+9)*(t-.5)=170 r=51 r+9=60 60*(t-.5)=170 60t-30=170 60t=200 divide by 20 3t=10 t=10/3=3 hrs 20 minutes or 51t=170 t=170/51=3.333