The equation to determine the weekly earnings of an employee at the hamburger shack is given by w(x), where x is the number of hours worked. w(x) = 10x, 0 ≤ x ≤ 40 15(x − 40) + 400, x > 40      determine the difference in salary, in dollars, for an employee who works 52 hours versus one who works 38 hours. determine the number of hours an employee must work in order to earn $445. explain how you arrived at this answer.