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I have posted a link there to this thread so the OP can view my work.Calculus help???! 10 points for quickest answer?

I'm trying to answer this question and I'm having a bit of a struggle

Consider the polynomial function f(x)= -5x^4+4x

a) Determine the x and y intercepts

y intercept: (at 0) = 0

x intercept (at 0) = 4/5

b) Determine the coordinates of the critical points

Critical points are 3/5 and 0.

c) Identify the nature of critical points

x<0 it's positivie

0<x<3/5 it's positive

x<3/5 it's negative

d) Determine the coordinates of the points of inflection

I got (2/5, 0.128) and (0,0)

e) Graph the function

Having trouble doing this..??? Help!

f) State the intervals of increase and decrease

g) State the intervals of concavity

x<0 concaves down

0<x<2/5 concaves up

x<2/5 concaves down

PLEASE show me how to sketch it..

Not sure if anyone is willing to do this but it's worth a try lol!

Thanks