5 by 3
3rd one
there we have to find hypotenuse.
Answer:
1)Add 19
2)Multiply by 5
Step-by-step explanation:

Adding 19 to both sides.

Multiplying 5 to both sides.

∴
Natural number because they are while
2(20 x 10) + 2(10 x 5) + 2(20 x 5)
2(200) + 2(50) + 2(100)
400 + 100 + 200
400 + 300
700
There are 700 square feet for the surface area