To calculate how much Julie would earn for working 7.5 hours at a rate of $9.50 per hour, you can use the formula:
\[ \text{Earnings} = \text{Hourly Wage} \times \text{Hours Worked} \]
Substituting in the values:
\[ \text{Earnings} = 9.50 \times 7.5 \]
Calculating that:
\[ \text{Earnings} = 71.25 \]
Julie would earn $71.25 for working 7.5 hours.