In which expression is the number 3 expressed as the coefficient of a variable

The factorization of 8x3 -125 is (2x-5)(jx2 +kx+25)

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%

Which of the following shows the length of the third side, in inches, of the triangle below