Answer Happy

Question 3 of 8 < > View Policies Current Attempt in Progress Evaluate the definite integral. S](619+ej++ k}dt -t O e19 1 1 :-(e--1);+ k 19 e19 'j+ 19 k 2 19 1 1 + k 2 19 i+ (234-1); +* e-! (819-1) i- (e-4-1) i + j k O e19-1 19 + 2

Question 4 of 8 < > View Policies Current Attempt in Progress Calculate fri(t) = r2(e) and " (+) x r2(0)) first by differentiating d d [. ( dt [rit) t dt the product directly and then by applying the formulas d dr2 dri [ri(t) r2(t)] = ri(t). + r2(t) and dt dt dt d dr2 dri [ri(t) x r2(t)] = ri(t) x + x r2(t). dt dt dt = . ) x t) ) * ri(t) = 8ti + 4tºj +6ťk, r2(t) = t4k = = () • t d [rı(t) · r2(t)] = dt d [ri(t) x r2(t)] = dt ) x t