The average cost per hour in dollars of producing x riding lawn mowers is given by the following. c(x)=0.7x^2+25x-258+(2500/x). (a) use a graphing utility to determine the number of riding lawn mowers to produce in order to minimize average cost. (b) what is the minimum average cost?

Circle a has a diameter of 7 inches, a circumference of 21.98 inches, and an area of 38.465 square inches. the diameter of circle b is 6 inches, the circumference is 18.84 inches, and the area is 28.26 square inches. part a: using the formula for circumference, solve for the value of pi for each circle. (4 points) part b: use the formula for area and solve for the value of pi for each circle. (4 points)