Calculus me to do number 2,3 and 4
don't do number 1
if you can do it step by step.

2. The slope of the line tangent to at is equal to (the value of the derivative at ). We have from (1a) that (I assume you've already shown this). Then from the point-slope formula, we get

3. This is just a matter of solving :

The corresponding points on the graph are and .

4. Take the definition of the derivative to be

Then for we have

so

the answer is 62.8 cubic units