This is a pond in the shape of a prism. It is completely full of water. Colin uses a pump to empty the pond. The level goes down by 30cm in the first 30 minutes. Work out how many minutes Colin has to wait for the pond to completely empty.

-3

step-by-step explanation:

a drawing really does here:

so i draw the horizontal line y=2 and the vertical line x=-2 at this intersection i put b (this is where my right angle is going to be).   so point b is at (-2,2).   point a is 5 units long and is also on y=2 so this point has to be (3,2) or (-7,2) -doesn't matter i will go with (3,2).

now we know c is at (-2,y) we don't know the y yet bet we know that c is on x=-2.

we have the area of the triangle is .5bh=12.5

we know the base length is 5 (ab)

we have the height is (2-y) if you look at your

plug in

.5(5)(2-y)=12.5

solve for y to get the y-coordinate for c

2.5(2-y)=12.5

divide both sides by 2.5 giving:

2-y=5

now subtract 2 on both sides

-y=3

y=-3

the answer would be 150 books

step-by-step explanation:

if you divide 300 by 2 you will get 150

explanation:

remove parenthesis:

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apply rule

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multiply fractions:

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divide:

=

mordancy.

2 1/2 feet

step-by-step explanation: