[-/1 Points] DETAILS SCALCET8 5.4.066. MY NOTES ASK YOUR TEACHER PRACTICE ANOTHER 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. (Use 6 equal subintervals.) 2 3 4 5 r(t 12 24 32 42 56 60 (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). (Use 3 equal subintervals.) Q(6) = tonnes Need Help? Read It Submit Answer SCALCET8 5.4.067. MY NOTES ASK YOUR TEACHER PRACTICE ANOTHER