What is the length of c in inches

Which of the following is the true for f(x) = 5cos

He weights of 2-pound bags of best dog food are approximately normally distributed with a given mean  and standard deviation  according to the empirical rule, what percentage of the bags will have weights within 3 standard deviations of the mean? 47.5%68%95%99.7%

With both problems. a. s.a. p directions on photo ^