f(x)= 2x^4-x^3-5x^2+15 use calculus and the graphs of f, f' and f'' to estimate to 2 decimal places, each of the...

f(x)= 2x^4-x^3-5x^2+15 use calculus and the graphs of f, f' and f'' to estimate to 2 decimal places, each of the following: a)The critical values of f b) The intervals where f is increasing and or decreasing c) The intervals where f is concave up and or down d) The inflection points of f e) graph f