Answer: 16 hours: 122x dollars
40 hours: 280x dollars
Explanation:
every hour, he makes 7x (dollars). Hours is represented by s. So we form the equation t = (7x)(s), where t is the total amount he makes. Using 16 hours for s, we get t = (7x)(16), or t = 122x. Total = 122x dollars. Same thing for 40 hours. s = 40, so t = (7x)(40), or t = 280x. Total = 280x dollars.