continuing education

Grace was doing her Google drive math homework  when she asked for some help…

Write an expression to show the following:

“If there are 100 bacteria in a petri dish, and they multiply doubling every hour, how many bacteria will there be after 7 hours?”

100 (27) = 12,800

Unless I audit some math classes over the summer, my role as math tutor looks to be on shaky ground.