Question

Mr. Mole left his burrow and started digging his way down.
\[A\] represents Mr. Mole's altitude relative to the ground (in meters) after
\[t\] minutes.
\[A=-2.3t-7\]
How fast did Mr. Mole descend?

Answer 1

The depth changes at the slope of A(t): dA/dt = -2.3 meters per minute. So he descended at 2.3 m/min downward (velocity = -2.3 m/min).