On #10 , how do i solve this equation? ?

Given: ac and db are diameters. m∠3=

Find the condition that the zeros of the polynomial f(x) = x^3+3px^2+3px+r may be in a.p.

Andy has $310 in his account. each week, w, he withdraws $30 for his expenses. which expression could be used if he wanted to find out how much money he had left after 8 weeks?