Please answer clearly and concisely

9. [-#1.12 Points] MY NOTES Suppose that a volcano is erupting and readings of the rate r(z) at which solid materials are spewed into the atmosphere are given in the table. The time tis measure: ASK YOUR TEACHER PRACTICE ANOT in seconds and the u for r{) are measured in tonnes (metric tons) per second. Note that r{} is increasing over the interval [0, 6] t of1] 2 3 4 5 & Ht) |z |8 |28|32|48 52|60 (a) Give upper and lower estimates (in tons) for the total quantity Q(6) of erupted materials after six seconds. (Use six equal subintervals.) lower estimate Q(6) = upper estimate Q(8) = tons tons (b) Use the midpoint rule to estimate Q(s) (in tons). (Use three equal subintervals.) ae) = tons