4. An acre is equal to 43,560 square feet, and there are 5280 feet in a mile. If a farm has the shape of a rectangle measuring 0.9 miles by 1.5 miles, what is the area of the farm in acres? (a) 0.164 acre (b) 11.14 acres (c) 864 acres (d) 1050 acres

Step 1 ：\( \text{Convert miles to feet: 0.9 miles} \times 5280 \text{ feet/mile} = 4752 \text{ feet, 1.5 miles} \times 5280 \text{ feet/mile} = 7920 \text{ feet} \)

Step 2 ：\( \text{Calculate area in square feet: } 4752 \text{ feet } \times 7920 \text{ feet} = 37635840 \text{ square feet} \)

Step 3 ：\( \text{Convert square feet to acres: } \frac{37635840 \text{ square feet}}{43560 \text{ square feet/acre}} = 864 \text{ acres} \)