To find out how much Keith would earn in 11 hours, we first need to determine his hourly wage.
Keith earns $39.00 in 4 hours, so we can calculate his hourly wage as follows:
\[ \text{Hourly Wage} = \frac{\text{Total Earnings}}{\text{Total Hours}} = \frac{39.00}{4} = 9.75 \text{ per hour} \]
Now, we can calculate how much he would earn in 11 hours:
\[ \text{Earnings in 11 hours} = \text{Hourly Wage} \times \text{Number of Hours} = 9.75 \times 11 \]
Calculating that gives:
\[ 9.75 \times 11 = 107.25 \]
Therefore, Keith would earn $107.25 in 11 hours.