Answer:

Step-by-step explanation:
step 1
Find the lateral surface of the cylinder (hot water tank)
The lateral area is given by the formula

we have

substitute


step 2
Find the volume of fiberglass composite needed
Multiply the lateral area by the thick

-----> exact value
assume


Answer:
40 square ft
Step-by-step explanation:
If its a square than 20 times 20 equals 40
Answer:

Step-by-step explanation:
First simplify the quadratic present

⇒