Answer:
100 square feet of decking
Step-by-step explanation:
<u><em>The picture of the question in the attached figure</em></u>
we know that
To find out the square feet of decking needed, subtract the area of the interior rectangle of the figure from the area of the complete rectangle
so

You can do this by finding the prime factors of 2352
2352 = 2 * 2* 2 * 2 * 3 * 7 * 7
We see that its not a perfect square because there is only one 3. If we multiply by another 3 we will have a perfect square.
2*2*2*2*3*3*7*7 = 7056 which is the smallest perfect square as required.
square root of 7056 = 2 *2 * 3 * 7 = 84 answer
28X0.86 = 24.08, therefore Joe made $24.08