Answer:
82
Step-by-step explanation:
The sum of scores for the 9 tests must be 90 * 9 = 810. The sum of scores for the 8 tests is 8 * 91 = 728 so the lowest score is 810 - 728 = 82.
<span>
By definition we have that the volume is given by:
</span>

<span> Where,
w: with
l: length
h: height
Substituting values we have:
</span>

<span> Rewriting:
</span>

<span> We look for the roots of the polynomial:
</span>

<span> We discard the negative roots because we want to find dimensions.
Thus, the dimensions are:
</span>

<span>
Answer:
the dimensions in inches are:
w = 10.2 inches
l = 70.2 inches
h = 18.6 inches</span>