Final answer:
Local Eats has the lowest unit rate for carrots at $0.70 per pound, after comparing the prices with Farm Fresh, Marthas, and Nature Delight.
Step-by-step explanation:
To determine which grocery store offers the lowest unit rate for carrots, we calculate the price per pound at each store:
Farm Fresh: $3.20 for 4 pounds = $0.80 per pound
Local Eats: ($1/10) / (1/7) pound = $0.70 per pound
Marthas: $9.00 for 9 pounds = $1.00 per pound
Nature Delight: $0.82 per pound
After calculating the unit rates, we find that Local Eats offers the lowest unit rate for carrots at $0.70 per pound.