Question

One year ago, Nolan could run a mile in m minutes. Since then, his time has decreased by 9%. Write two different expressions that represent the number of minutes it now takes Nolan to run a mile, and show or explain why the expressions are equivalent.

Answer 1

I just wrote: 1m-9% (of the time) and 1m-0.09 (multiplied by the time). This makes sense because 9% and 0.09 are equal, just one of them is in decimal form.