I don't know what to do with this. Help please.
Suppose that a volcano is erupting and readings of the rate r(t) at which solid materials are spewed into the atmosphere are given in the table. The time t is measured in seconds and the units for r(t) are tonnes (metric tons) per second.
(a) Give upper and lower estimates for the total quantity Q(6) of erupted materials after 6 seconds.
Q(6) = ? tonnes (lower estimate)
Q(6) = ? tonnes (upper estimate)
(b) Use the Midpoint Rule to estimate Q(6).
Q(6) = ? tonnes