Final answer:
Using the provided equation, it's found that 1326 acres are left after 20 hours, 1230 acres after 100 hours, and it would take 1125 hours to mow all the lawns.
Step-by-step explanation:
The unit rate of the amount of lawn mowed per hour is not explicitly mentioned in the question, and it seems to be incomplete.
Additionally, there is no equation provided that connects the partial lawn mowing mentioned in the original incomplete question. However, using the provided equation ŷ = 1350 - 1.2x, we can solve for different values and scenarios:
Acres left to mow after 20 hours: To find out how many acres are left after 20 hours, substitute x with 20 into the given equation. ŷ = 1350 - 1.2(20) = 1350 - 24 = 1326 acres left.
Acres left to mow after 100 hours: Substitute x with 100. ŷ = 1350 - 1.2(100) = 1350 - 120 = 1230 acres left.
Hours to mow all lawns: To find out when ŷ = 0, set the equation to 0 and solve for x. 0 = 1350 - 1.2x. x = 1350 / 1.2 = 1125 hours.
The actual unit rate can be calculated if the question's typo '- of the lawn in-hour' was meant to say a fraction of the lawn mowed in one hour.