Simplify 3-2y+(-8y) + 8.5.

=−10y+11.5

Step-by-step explanation:

Let's simplify step-by-step.

3−2y−8y+8.5

=3+−2y+−8y+8.5

Combine Like Terms:

=3+−2y+−8y+8.5

=(−2y+−8y)+(3+8.5)

=−10y+11.5

x + 107

step-by-step explanation:

let's say that the number he had before the mistake was x. then, he will have 107 dollars more than this, so the answer is x + 107.