I am lost with this question, will you help me through this one?

The total number of words, M(t). that a person can memorize in t minutes is shown in the graph below, Complete parts a) and b) to the right a) Find the average rate of change of M as t changes from 0 to 8; from & to 16, from 16 to 24; from 24 to 32, from 32 to 36. The average rate of change of M as ! changes from 0 to & is | words/min. (Simplify your answer.] of The average rate of change of Mast changes from 8 to 16 is |words/min. 4 (Simplify your answer.) 30 (32.20) (24.20) The average rate of change of M as t changes from 16 to 24 is |words/min. (16,16) (Simplify your answer.) (36.20) The average rate of change of M as t changes from 24 to 32 is |words/min. * (8,4) (Simplify your answer.) 16 24 323640 The average rate of change of M as t changes from 32 to 36 is ]words/min. (Simplify your answer.) Note: Graph not drawn to scale b) Explain the behavior of the average rates of change after 24 min. O A. The graph becomes vertical and therefore has no slope