10 inches to 12 inches
10:12
5:6
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No don't pleeeeeeassssseeer
The answer is 12/7 of an hour, hope it helps
The C(x) equation is a parabola with a squared "x" and a positive leading term coefficient, meaning, is a vertical parabola and it opens upwards
the lowest point, or lowest cost value, it reaches, is the U-turn point, or vertex

so, the lowest cost is at