Start with

Subtract 15 from both sides:

Divide both sides by 2a:

The area of the base of the first sandbox is 64 square feet.
Explanation:
Earlier it said the first sandbox has a SQUARE base and its side length is 8 feet. Its asking for the area of the square base, so follow this formula:
Side length^2
In this case is:
8^2 = 64
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A = 4(187*230/2) + 230²
A = 4*21505 + 230²
A = 86 020 + 52 900
A = 138 920 m²
Hope this helps !
Photon
Answer:
Distance = speed x time.
Step-by-step explanation:
Hope I helped