Question

One year ago, Anne could run a mile in M minutes. Since then her time has decreased by 16%. Write two expressions that represent the number of minutes it now takes Anne to run a mile, and show or explain why the expressions are equivalent.

Answer 1

M-(M•0.16) and M(.84) because the first one you need to multiply to find what 16% of m is then subtract that by m for the second one you subtract .16 from 1 which is .84, then you multiply that by m which will automatically take the 16% decrease which will give you your answer. Both ways give you a 16% decrease of m. I hope this helped