Question

Use the graph representing bacteria decay to estimate the domain of the function and solve for the average rate of change across the domain.

Answer 1

We'd need the graph to really be able to solve this, but

as for domain, it should be the x values (they might use t) across which the bacteria is still decaying

as for average rate of change across the domain

(final bacteria amount) - (initial bacteria amount) then divide by the (final domain value - initial domain value)