Answer: 1-1/2
Step-by-step explanation: The unit rate would be amount of fertilizer for 1 hour.
Since 3/4 square foot is used in 1/2 hour, you would need twice as much for 1 hour:
3/4 • 2 = 6/4 square feet in 1 hour. As a Mixed number this would be 1-1/2 or