9f + 4 - 7f = 8 pls help

Abus travels 36 miles in 45 minutes. enter the number of miles the bus travels in 60 minutes at this rate.

How much orange juice do you need to make 2 servings of lemony orange slush?

He ! a group of farmers planned to clean 80 acres of wheat per day to finish the work on schedule. right before the work started, they received a new piece of machinery that them clean 10 more acres per day than originally planned. as a result of increased productivity in the last day before the deadline they only had to clean 30 acres. how many acres of wheat did the group of farmers have to clean?