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richwmiller answered: 9132 problems
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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):
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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
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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
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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):
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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):
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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
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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.
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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):
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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):
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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
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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 7:30
1 solutions
Answer 344920 by richwmiller(9143) on 2011-10-19 12:25:36 (Show Source):
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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 work
1 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
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Linear-systems/517773: A grocer mixes cashews and almonds. A mixture of 4 pounds of cashews and 6 pounds of almonds cost $62. A mixture of 2 pounds of cashews and 8 pounds of almonds cost $54. What is the cost per pound of cashew and almonds?
Graphically?
1 solutions
Answer 344901 by richwmiller(9143) on 2011-10-19 11:48:32 (Show Source):
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Rate-of-work-word-problems/517460: Please, I need help setting this prob up...this is college pre-algebr extra credit.
Painter A paints a house in 3 days
Painter B paints a house in 5 days
How long would it take if they painted together?
So I know it takes B 2 more days than A so is it something like B+2=?? or 1/3+1/5=X
1 solutions
Answer 344788 by richwmiller(9143) on 2011-10-18 20:59:40 (Show Source):
You can put this solution on YOUR website!close
We know it has to be less than 3 days since painter a can do it alone in three days.
x/3+x/5=1
Why 1?
One is the whole job.
In one day painter a does 1/3 of the job and painter b does 1/5 of the job.
In x days painter a does x/3 and painter b does x/5 of the job.
5x+3x=15
8x=15
x=15/8
x=1 7/8 days
Assuming a work day is 8 hours, it will take 15 hours together.
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expressions/517456: I'm not sure how to solve this:
Write an equation and solve.
Tripling the greater of two consecutive even integers gives the same result as subtracting 10 from the less even integer. What are the integers?
1 solutions
Answer 344783 by richwmiller(9143) on 2011-10-18 20:49:04 (Show Source):
You can put this solution on YOUR website!The integers are x and x+2
3*(x+2)=x-10
3x+6=x-10
subtract x from both sides
subtract 6 from both sides
2x=-16
x=-8
-8+2=-6
check
3*(-6)=-8-10
-18=-18
ok
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Linear-equations/517450: (2,3) and (0,-7} equation y= How do I solve this problem?
1 solutions
Answer 344779 by richwmiller(9143) on 2011-10-18 20:41:17 (Show Source):
You can put this solution on YOUR website!There is no problem.
You didn't say what (2,3) and (0,-7) are.
There is no question.
Perhaps, you want to ask for the equation of a line going through two points (2,3) and (0,-7).
But you didn't.
We are not mind readers.
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