Let f(x, y) = xy2 and r(t) = (#15). Calculate V f. (Use symbolic notation and fractions where needed. Express numbers in exact form. Give your answer in the form (*, 1:). ) Calculate r' (I). (Use symbolic notation and fractions where needed. Express numbers in exact form. Give your answer in the form (ate, at). ) Use the Chain Rule for Paths to evaluate % f (r(t)) at t = 1.3. (Use decimal notation. Give your answer to three decimal places.) a' Ef(l'(1-3)) = Use the Chain Rule for Paths to evaluate % f (r(t)) at t = 1.8. (Use decimal notation. Give your answer to three decimal places.) " - aW'LW