Explanation:
Expression of Sayed weekly earnings = 8.50t + (1.5)(8.50)p = 8.50t + 12.75p
where t is the number of hours worked regularly and p is number of hours worked overtime.
Part 1)
Given t = 36 and p = 4,
Gross Weekly earnings = 8.50(36) + 12.75(4)
= 306 + 51
=$357
Part 2)
Given Gross weekly earnings = $420.75 and t=36,
8.50(36) + 12.75p =420.75
306 + 12.75p = 420.75
12.75p = 420.75-306
12.75p = 114.75
p = 114.75÷12.75
p=9