Question

85 - 7.2t = 25.24

(not rounded)

Answer 1

`-7.2t=25.4-85\\-7.2t=-59.76\\(-7.2t)/(-7.2) =(-59.76)/(-7.2) \\t=8.3`

Hope I helped.

Answer 2

-7.2

Explanation:

The derivative of a polynomial is the sum of the derivatives of its terms. The derivative of a constant term is 0. The derivative of ax

n is nax

n−1.

Subtract 1 from 1.

For any term t except 0, t

0 =1.