Great Question!
The last year part is extra information. 1200÷12 (months in a year)= 100
He will have to wash 100 cars each month.
The question is actually a financial banking question if it is about his check and how much it was worth statistics would be a couple of other things into a group and ranked. Financial is money.
To answer this question we will have to understand the nature of
.
can be rewritten as:
. Now,
is an irrational number and thus any of the four operations of addition, multiplication, subtraction or division placed anywhere between any of these terms will always result in an irrational number.
The only way irrational numbers can be made rational is by dividing or multiplying the given irrational number by the same irrational number.
Slope intercept form is y=mx+b. So let's use the given equation and turn it into this form.

Move the -3x to the right side

Divide both sides by -5

This should be your answer, let me know if you need any clarifications, thanks!