Final answer:
Jenna will make 168 shirts in 4 hours by setting up a direct variation proportion and solving for the unknown.
Step-by-step explanation:
The number of shirts Jenna can make varies directly with the amount of time she spends making them. Since it is given that she makes 14 shirts every 1/3 of an hour, we can calculate how many shirts she can make in 4 hours by setting up a proportion:
14 shirts / (1/3 hour) = x shirts / 4 hours
To find x, we can cross multiply and divide:
14 shirts × 4 hours = x shirts × (1/3 hour)
x = (14 × 4) / (1/3)
x = 56 × 3
x = 168 shirts
Therefore, Jenna will make 168 shirts in 4 hours.