Answer:
The surface area is 270in units squared
Step 1. <span>Gather like terms
</span>

<span>
Step 2. </span><span>Use </span>Product Rule:


Step 3. Simplify brackets

Step 4. Simplify

to


<span><span><span>7+5{x}^{2}-10</span><span /></span></span>

A is amount accrued in one year
to get the interest earned, simply subtract the Principal from the
amount A
Set the bottom equal to 0
x - 8 = 0
x = 8
The total is 94.2.
Hope this helps!