Explain how you can cut a rectangle cake for 5 friends so that they can have a equal amount

In the diagram, the measure of angle 9 is 85° which angle must also measure 85°?

This is my question~~ ( r ^ 4 - 2r ^ 3 - 23 r ^ 2 - 4r - 32)÷(r+4) ~~ i must use long division to solve it : / i was wondering if anyone world like to solve it. and if so, share step-by-step explanations! you! ❤

Three times the sum of a number and seven is negative thirty-six. what is the number?