Cancel r 2 (s 4 t)/(st 3) 2 Use Quotient Rule: xa/xb=x^a−bs^4−1 t^1−33 Simplify 4−1 to 3 s^3 t^1−34 Simplify 1−3 to −2 s^3 t^−25 Use Negative Power Rule: x^−a=1/xas^3×1/t 26 Simplify (s 3)/(t 2) Done so the answer is a. Then