I have to prove this inscribed angle. Thank you!

Solve 2x+y=3 x+y=5 in substitution method

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! ❤

Combine the information in the problem and the chart using the average balance method to solve the problem.