Final answer:
By working 10 hours as a football referee and 30 hours as a bus driver, both jobs paying $21 per hour, Steve earns $840 each week.
Step-by-step explanation:
To calculate how much Steve earns each week, we need to add up his earnings from both jobs.
Steve works 10 hours per week as a football referee, and the pay rate is $21 per hour. So, the earnings from refereeing each week would be $21 multiplied by 10, which is $210.
Additionally, Steve works 30 hours per week as a bus driver, earning $21 per hour. Therefore, the earnings from driving the bus each week would be $21 multiplied by 30, which is $630.
Finally, to find the total earnings, we add the earnings from both jobs: $210 + $630 = $840.
Steve earns $840 each week.
Learn more about Calculating earnings from multiple jobs