Please help this is important for a new quiz i am taking i dont understand to much

Factor the expression using the gcf. the expression 21m−49n factored using the gcf

Steve had 48 chocolates but he decided to give 8 chocolats to each of his f coworkers. how many chocolates does steve have left

Aculture started with 2,000 bacteria. after 8 hours, it grew to 2,400 bacteria. predict how many bacteria will be present after 19 hours . round your answer to the nearest whole number. p=ae^kt