Jenny earns $9.10 an hour for mowing and $7.50 an hour for babysitting. To find out how much she will earn for 1 hour of mowing and 3 hours of babysitting, we need to calculate the total amount she will earn for mowing and babysitting separately, and then add them together.
For 1 hour of mowing, Jenny will earn $9.10.
For 3 hours of babysitting, Jenny will earn:
3 hours × $7.50 per hour = $22.50
Adding the amount she earns for mowing and babysitting together, we get:
$9.10 + $22.50 = $31.60
Therefore, Jenny will earn $31.60 for 1 hour of mowing and 3 hours of babysitting