Answer:
-15
Step-by-step explanation:
Answer:

Step-by-step explanation:
we know that
The area of the backyard pool to be resurfaced is equal to the area of the base plus the area of its four lateral sides.
so

where
B is the area of the base
P is the perimeter of the base
H is the depth of the pool
<em>Find the area of the base B</em>

substitute the given values

<em>Find the perimeter of the base P</em>

substitute the given values

we have

<em>Find the area of the backyard pool to be resurfaced</em>

substitute the values


Answer:
5y·2x=21
<em>
</em>
Step-by-step explanation:
using the formula above,you will find the equation 5y–2x=21