Amelia makes $8 per hour at her job and then earns an additional $15 for every tablet she sells. she uses the expression 8h + 15t to keep track of her earnings. part a: identify the coefficients and variables in the expression. (3 points) part b: how many terms are in the expression, what are they, and how do you know? (4 points) part c: which term in the expression shows the total earned for the number of tablets sold?