Answer:
(d) Yes, it is proportional because the farmer collected 180 bushels for every 1 acre harvested.
Step-by-step explanation:
You want to know if the ratios 4 acres : 720 bushels and 7 acres : 1260 bushels represent a proportional relationship.
A relationship is proportional if the ratio of the dependent variable to the independent variable is a constant. We can check this for the numbers given:
(720 bu)/(4 ac) = 180 bu/ac
(1260 bu)/(7 ac) = 180 bu/ac
The ratios are the same, 180 bushels for each acre, so the relationship is proportional.