The cost, in dollars, of producing x belts is given by upper c (x )equals 751 plus 12 x minus 0.067 x squared. find the rate at which average cost is changing when 256 belts have been produced.

Missouri has a shape that is similar to a trapezoid with bases of about 198 miles and 276 miles and a height of about 270 miles. what is the area of missouri in square miles? explain how you found the answer.

15 points ! ~ see if you know the answer to both you!

Brainlest answer can you find the area and circumference of a circle given the radius or diameter? if its yes or no explain why