To achieve a positive profit p(x)>0, we start with:

Next, we solve for x:

The parameters are:
a = -2
b = 7
c = -3
We will apply the quadratic formula:

This yields two results—one a fraction, the other a whole number. We focus on the whole number since the muffins sold must be a complete unit. Thus we conclude:
x>3
Subtracting seven from sixteen results in nine
The solution is nine
Time required equals 66 2/3 minutes, which is equivalent to approximately 1.11 hours.
1. Angle DEF
2. Definition of congruent angles
3. Measure of angle GHI