To determine which brand of grass seed has the lowest cost per square foot, we need to calculate the cost per square foot for each brand.
Brand A:
- Price: \( $18.99 \)
- Coverage: \( 3,000 \) square feet
- Cost per square foot: \( \frac{18.99}{3000} \approx 0.00633 \) dollars/sq ft
Brand B:
- Price: \( $22.99 \)
- Coverage: \( 4,000 \) square feet
- Cost per square foot: \( \frac{22.99}{4000} \approx 0.00575 \) dollars/sq ft
Brand C:
- Price: \( $31.99 \)
- Coverage: \( 5,000 \) square feet
- Cost per square foot: \( \frac{31.99}{5000} \approx 0.006398 \) dollars/sq ft
Brand D:
- Price: \( $36.99 \)
- Coverage: \( 6,000 \) square feet
- Cost per square foot: \( \frac{36.99}{6000} \approx 0.006165 \) dollars/sq ft
Now we compare the costs per square foot:
- Brand A: \( \approx 0.00633 \)
- Brand B: \( \approx 0.00575 \)
- Brand C: \( \approx 0.006398 \)
- Brand D: \( \approx 0.006165 \)
The lowest cost per square foot is from Brand B, at approximately \( 0.00575 \) dollars per square foot.
Therefore, Brand B has the lowest cost per square foot.