PLEASE HELP it’s been an hour I think part b is b but I have no clue what either is it’s algebra 2 average rate of change

Multiply. −2x(6x4−7x2+x−5) express the answer in standard form. enter your answer in the box.

Name the most appropriate metric unit for each measurement

There are three bags: a (contains 2 white and 4 red balls), b (8 white, 4 red) and c (1 white 3 red). you select one ball at random from each bag, observe that exactly two are white, but forget which ball came from which bag. what is the probability that you selected a white ball from bag a?