Algebra-1

To find which rate is equivalent to $9 per hour, we need to check which option gives the same rate by dividing the total amount by the number of hours.

Option A, $27 in 3 hours

27/3 = 9 dollars per hour

This is equivalent to $9 per hour.

Option B, 28 in 4 hours

28/4 = 7 dollars per hour.

This is not equivalent to $9 per hour.