<h3>Given</h3>

<h3>Find</h3>

<h3>Solution</h3>

The derivative of the average cost function at n=10 is -0.30.
We have that
cos(alfa)=0.2546
arc cos (0.2546)=75.2501---------- > 75.25°
the answer is 75.25°
The distance between those two points is 8 because its a straight line...