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test/714844: a boy is three years older than his sister.the sum of their square ages is 369.how old are they 1 solutions
Answer 439034 by Alan3354(30993) on 2013-02-15 15:36:47 (Show Source):
You can put this solution on YOUR website!a boy is three years older than his sister.the sum of their square ages is 369.how old are they
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(x - 15)*(x + 18) = 0
x = 15
--> 15 & 18
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Ignore the negative solution.
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Coordinate-system/714920: if a circle is centered at the midpoint of (3,-2) and (5,11). Find the equation of that circle. Show work. 1 solutions
Answer 439030 by Alan3354(30993) on 2013-02-15 15:32:50 (Show Source):
You can put this solution on YOUR website!if a circle is centered at the midpoint of (3,-2) and (5,11). Find the equation of that circle. Show work.
-----------------
To find the midpoint, get the average of x & y separately
x: (3+5)/2 = 4
y: (-2+11)/2 = 4.5
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The center is (4,4.5)
You didn't give the radius.
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Geometry_Word_Problems/714910: the question is.. An irrigation system waters a circular field that has a 60-foot radius. Find the exact area watered by the irrigation system.
i was using the formula Pi*r^2
thank you for your help 1 solutions
Answer 439027 by Alan3354(30993) on 2013-02-15 15:16:46 (Show Source):
You can put this solution on YOUR website!the question is.. An irrigation system waters a circular field that has a 60-foot radius. Find the exact area watered by the irrigation system.
i was using the formula Pi*r^2
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What did you get?
Area = pi*r^2 in sq feet.
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Word_Problems_With_Coins/714783: 1- a metalic pipe is .7cm thick inner radius of the pipe is 3.5cm and length is 5dm find its total surface area
1 solutions
Answer 439000 by Alan3354(30993) on 2013-02-15 09:24:21 (Show Source):
You can put this solution on YOUR website! 1- a metalic pipe is .7cm thick inner radius of the pipe is 3.5cm and length is 5dm find its total surface area
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The length is 50 cm
The inner radius is 3.5 cm

= 350pi sq cm
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The outer radius is 4.2 cm

= 420pi sq cm
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The area of each end is  sq cm
=====================
Total area = 780.78*pi sq cm
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Graphs/714819: Find three solutions of the equation for y 6y=30x-6 when x is 0 I have two other values for x but I hope to figure them out from your example 1 solutions
Answer 438992 by Alan3354(30993) on 2013-02-15 08:54:23 (Show Source):
You can put this solution on YOUR website!Find three solutions of the equation for y 6y=30x-6 when x is 0 I have two other values for x but I hope to figure them out from your example
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6y = 30x - 6
y = 5x - 1
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x = 0 --> y = -1
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x = 1
y = 5*1 - 1 = 4
x = 1 --> y = 4
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x = 2
y = 5*2 - 1 = 9
x = 2 --> y = 9
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x = 100
y = 5*100 - 1 = 499
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Proportions/714650: If a 0.27 cm long crystal appears to be 13.5 cm long under a microscope, what is the power of the microscope? 1 solutions
Answer 438932 by Alan3354(30993) on 2013-02-14 20:24:51 (Show Source):
You can put this solution on YOUR website!If a 0.27 cm long crystal appears to be 13.5 cm long under a microscope, what is the power of the microscope?
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13.5/0.27 = 50x
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Quadratic_Equations/714640: One number is four more than three times another number. Find the numbers if the product is 175.
What I have tried: 3n(n+4)= 175
3n^2+9-175
1 solutions
Answer 438914 by Alan3354(30993) on 2013-02-14 18:44:11 (Show Source):
You can put this solution on YOUR website!One number is four more than three times another number. Find the numbers if the product is 175.
What I have tried: 3n(n+4)= 175 **** How did you come up with that?
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n = a number
The other number is 4 plus 3 times the 1st number, = 3n+4
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n*(3n+4) = 175
Start from there.
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Exponents/714617: can you help me simplify the equation of (-4/c)and the exponent of 2?
1 solutions
Answer 438912 by Alan3354(30993) on 2013-02-14 18:30:47 (Show Source):
You can put this solution on YOUR website!can you help me simplify the equation of (-4/c)and the exponent of 2?
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Equations have equal signs.
Equal, equate, equation
 has no equal sign, so it's not an equation.
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Is that simpler? Or just different?
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Word_Problems_With_Coins/714502: A vending machine that takes only dimes and quarters contain 30 coins, with a total value of $4.20. How many of each coin are there?
1 solutions
Answer 438849 by Alan3354(30993) on 2013-02-14 13:45:22 (Show Source):
You can put this solution on YOUR website!A vending machine that takes only dimes and quarters contain 30 coins, with a total value of $4.20. How many of each coin are there?
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d + q = 30 (# of coins)
10d + 25q = 420 (total cents)
Can you do the rest?
====================
Another method:
30 dimes = $3.00
For each dime replaced by a quarter, 15 cents is added
420 - 300 = 120
120/15 = 8 quarters
22 dimes
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Travel_Word_Problems/714542: Rene is going to the lake to visit some friends. If the lake is 60 miles away, and Rene is driving at 40 miles per hour the entire time, how long will it take her to get to the lake? 1 solutions
Answer 438847 by Alan3354(30993) on 2013-02-14 13:36:42 (Show Source):
You can put this solution on YOUR website!Rene is going to the lake to visit some friends. If the lake is 60 miles away, and Rene is driving at 40 miles per hour the entire time, how long will it take her to get to the lake?
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d = r*t
t = d/r
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Travel_Word_Problems/714481: a car travels at 21x y^2 Kilometers per hour.
How far will the car travel in:
a. (2x+y) hours
b. (2x+1) hour
c. (y+2) hours
d. st 1 solutions
Answer 438839 by Alan3354(30993) on 2013-02-14 12:57:53 (Show Source):
You can put this solution on YOUR website!a car travels at 21x y^2 Kilometers per hour.
How far will the car travel in:
a. (2x+y) hours
b. (2x+1) hour
c. (y+2) hours
d. st
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The speed expression is not clear.
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d = r*t, r = the rate, or speed
a. d = r*(2x+y)
etc
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Rate-of-work-word-problems/714528: Person 1 can do a certain job in twenty-one minutes, and person 2 can do the same job in twenty-eight minutes. When completing the job together, which expression would be used to represent the amount of work done by person 1?
1 solutions
Answer 438832 by Alan3354(30993) on 2013-02-14 12:51:01 (Show Source):
You can put this solution on YOUR website!Person 1 can do a certain job in twenty-one minutes, and person 2 can do the same job in twenty-eight minutes. When completing the job together, which expression would be used to represent the amount of work done by person 1?
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Anything you like.
x, y, P1, P21, f, etc
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Angles/714479: Suppose that angles measure 2x and 4x+6 are supplementary. What are the measures of the angles 1 solutions
Answer 438806 by Alan3354(30993) on 2013-02-14 08:57:18 (Show Source):
You can put this solution on YOUR website!Suppose that angles measure 2x and 4x+6 are supplementary. What are the measures of the angles
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2x + (4x+6) = 180 degs
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