Show your work.

4. there are 5,280 feet in a mile. how many feet are in 7/11 of a mile.

5. a rectangle measures 4 2/3 x 3 3/7 inches. what is the area. give your best answer as a simplified mixed number or as a whole number.

Abcd is a square. what is the measure of angle bac

Can someone tell me if this is perpendicular? !

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?