What is the angle of 3?

In angle pqr find the measure of

Need plz been trying to do it for a long time and still haven’t succeeded

Consider this expression and the steps to evaluate it. 4^5(−2)^9/4^8(−2)^3 1. apply the quotient of powers:      (−2)^a/4^b 2. evaluate powers:           c/d select the value of each variable. a = _ b = _ c = _ d = _