Please help I just need brief explanation. Very simple

(1) The second derivative of y = 3x3 + x2 + 9x -1 is (2) Evaluate lim x' x -1x3. 1 (3) Compute the average valueof f(x) = 3x2 - 6x over the interval [1, 3]. (4) Evaluate the definite integral 6 x'sin(x) dx -6 (1+x2)2 (5) Evaluate Je ox dx. x3 +x (6) Given y = J54,2 sin(t) dt, evaluate dy dx (7) Compute the Taylor polynomial of degree 3 about 3 for function f (x) = e2x