3d49b1…: “Such as a super home”

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An oil refinery produces oil at a variable rate given by

\[ Q'(t) = 2000 - 20t \]

for $0\leq t\leq 40$. Here $t$ is measured in days, and $Q$ is measured in barrels.

Select the number of barrels produced in the first 10 days.

1800 18000 19900 21000 19000 None of the above answers.