Answer:

Step-by-step explanation:
Given 
Let 
Interchange x and y

Solve for y, by first squaring both sides


Hence

The last choice is correct
The perimeter is 72 because all sides on a square are the same measurements so you just have to do 18 times 4 to get 72
Answer:youywould be able to find the base.
Step-by-step explanation:
Formula for Volume of a cylinder is : V=Bh
Answer:
21 hours
Step-by-step explanation:
You and your friend swam for 10 hours then took a break then swam for 11 so 10+11=21 so you and your friend swam for 21 hours all together.