How can I solve 4+r/9 =2?

Divide. –40 ÷ –5 a –8 b 200 c -200 d 8

The height of a plant, in inches, p years after planting it is given by the polynomial function r(p) = -2p% + 270p. find the height of the plant when p = 90 years.

What is 60.9643790503 to 5 decimal