Answer:
40d + 10(1.5d) = 770 can be used to determine Martin's hourly pay.
Explanation:
Given that:
Hourly rate = d 
Earning to first 40 hours = 40d 
Earning of more than 40 hours = 1.5d 
Amount paid per week = $770 
Hours worked = 50 hours 
first 40 hours + 10 hours = total earned 
40d + 10(1.5d) = 770 
Hence,
40d + 10(1.5d) = 770 can be used to determine Martin's hourly pay.