Answer: They are not equivalent. Working 4 hours for $12 is the same as working 1 hour for $3, and working 7 hours for $28 is the same as working 1 hour for $4.
Step-by-step explanation:
The ratios are:
4h : $12 and
7h : $28
Then, we simplify to fine the unit rates.
12/4 = 3
1h : $3 and
28/7 = 4
1h : $4