I need help with trigonometric pleasee

Apple pie is removed from 350 degree oven. temperature of the pie t minutes after being removed id given by the function t(t)=72+268e-0.068t

Atheater wants to build movable steps that they can use to go on and off the stage. they want the steps to have enough space inside so they can also be used to store props. how much space is inside the steps?

What is the measure of ac? 5 units 13 units 26 units 39 units 3x- 2b 6x + 9