Keisha earns nine dollars each hour working part time at a bookstore C earns one additional dollar for each book that she says let a be the amount in dollars Keisha earn in an hour if he sells E books right in the Quetion relating a to BN graft your equation users using the axes below

Agroup 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?