Hey!
To find out how long it would take for both functions to equal the same thing, you would set them equal to each other, like this:
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Then you would combine like terms. Keep in mind that when doing operations over the equal sign, you have to do the opposite operation. After combining like terms, you would have
So at this point, you just simplify.
It would take 5 months for the amount of money to be equal. She would save $250 with either option.
Hope this helped :)
ANSWER
Find out the how many milliliters of water did coach Kelly put in each cooler.
To proof
let us assume that the water put in the each cooler be x.
As given
Coach Kelly bought 32 L of water
she divied the water equally between 8 coolers
1 litre = 1000 miilitre
solving the above
x = 4000 millitre
therefore 4000 milliliters of water did coach Kelly put in each cooler.
Hence proved