Answer:
.5236
Step-by-step explanation:
Formula for sphere volume:
V = 
substiture 0.5 for r:
= .5236
I'm using PEDMAS.
Multiplication first.
2 • 4 = 8
Subtraction.
20 - 4 = 16
16 + 8 = 24
Please let me know if you spot any errors (especially the fraction operation)
The answer is 1.063× 10 to the 2nd power
I suppose you mean

Differentiate one term at a time.
Rewrite the first term as

Then the product rule says

Then with the power and chain rules,

Simplify this a bit by factoring out
:

For the second term, recall that

Then by the chain rule,

So we have

and we can simplify this by factoring out
to end up with

Through trial and error:
(7x-6)(3x-2)
Usually it works best to test out a number of possibilities :)