Maria want to make a footstool in the shape of a cylinder, as show below. she wants to fill the footstool with foam and cover it with fabric. r=12in by h=18in

Volume = 8143.01 surface area =2261.95

Explanation:

V=

plug in variables

use PEMDAS &solve for v

12 squared=144

pi times 144 is approximately 452.39

V = 8143.01

A=

plug in variables, simplify, use PEMDAS to solve for A

c. because step up transformer steps up the input voltage i.e increases the input voltage  

the number of turns are greater on the secondary side of step up transformer  

transformer does not handle dc current

im pretty sure its b