How do you do this question?

∫₋₃¹ π y⁴ dy

Step-by-step explanation:

If we slice the solid shape, we get circular cross sections or disks.  The thickness of each disk is dy.  The radius of each disk is x.  So the volume of each disk is:

dV = π r² h

dV = π x² dy

Since x = y²:

dV = π y⁴ dy

The total volume is the sum of all the disks from y=-3 to y=1.

V = ∫ dV

V = ∫₋₃¹ π y⁴ dy

b

step-by-step explanation:

a difference is the result of subtraction. while each of these expressions has subtraction in it, a difference will be the result when subtraction is the last operation applied in the order of operations for the expression. this means subtraction must be outside of the parenthesis. only b has this.