Which options could be the next step in simplifying this expression?
8 x (2 x 9)
choose exactly two answers that are correct
a. 16 + 72 (use the distributive property)
b. 8 • 18 (use order of operations)
c. 16 • 9 (use the associative property)
d. 8 • 2 + 9 (use the associative property)

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?