Evaluate the expression when a=-4 and x=4

7a-x

What is the approximate circumference of the circle shown below?

Which representation has a constant of variation of -2.5

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%