A medical equipment industry manufactures x-ray machine. The unit cost C (the cost in dollars to make each X-ray machine) depends on the number of machines made. if x machines are made, then the unit cost is given by the function c(x)=0.2x^2-36x+8122. How many machines must be made to minimize the unit cost? Do not round your answer.
Number of x-ray machines:​

The number of chocolate chips in a bag of chocolate chip cookies is approximately normally distributed with a mean of 12611261 chips and a standard deviation of 118118 chips. (a) determine the 2626th percentile for the number of chocolate chips in a bag. (b) determine the number of chocolate chips in a bag that make up the middle 9696% of bags. (c) what is the interquartile range of the number of chocolate chips in a bag of chocolate chip cookies?