Which expression would be easier to simplify if you used the associative property to change the grouping?

On average, how many more hits will he get when he bats 100 times at home during the day as opposed to 100 times away at night?

What is the measure of one interior angle of a pentagon

Tom can paint the fence in 12 hours, but if he works together with a friend they can finish the job in 8 hours. how long would it take for his friend to paint this fence alone?