Would a part of a circle or a semi ellipse be better as a roof shape?​

This is fractions casey shared a pizza with some friends.they each ate 1 third of the pizza. how many people shared the pizza

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! ❤

Factor the expression using the gcf. the expression 21m−49n factored using the gcf