84 is 12%of what number
please hurry

Ineed ! i can’t figure out this graph

Find the sum of the given arithmetic series. 24 + 17 + 10 + 3 + + (–39)

The seasonal output of a new experimental strain of pepper plants was carefully weighed. the mean weight per plant is 15.0 pounds, and the standard deviation of the normally distributed weights is 1.75 pounds. of the 200 plants in the experiment, how many produced peppers weighing between 13 and 16 pounds