14. [0/0.69 Points] DETAILS PREVIOUS ANSWERS S Find the derivative, r'(t), of the vector function. r(t) = a + 2tb + tc r'(t) = b + 7 tc X Need Help? Read It Watch It Submit Answer16. [-/0.69 Points] DETAILS SCALCET8 13.3.045. The curvature of a plane parametric curve x = f(t), y = g(t) is ary - yx K = [2 + 23/2 where the dots indicate derivatives with respect to t. Use the above formula to find the curvature. x = 4el cos(t), y = 4et sin(t) K(t) = Need Help? Read It Watch It 17. [-/0.69 Points] DETAILS SCALCET8 13.2.519.XP. Evaluate the integral. (cos ( 4it)i + sin ( 2nt )j + +3 k) dt + C Need Help? Read It