Final answer:
The total land area of lawns in the United States calculated from the given data (90 million Americans with an average lawn size of 0.8 acres) and converting acres to hectares (1 acre = 0.4047 hectares) is 29,138,400 hectares, which does not match any of the provided answer choices, indicating a possible error in the question or the answer options.
Step-by-step explanation:
To calculate the total land area in hectares composed of lawns in the United States, we'll start with the given statistics: there are approximately 90 million Americans with a lawn, and the average lawn size is 0.8 acres. We will use the conversion factor that 1 acre is equivalent to 0.4047 hectares.
Finding the total lawn area in acres is the first step:
Total lawn area (acres) = Number of lawns × Average lawn size = 90,000,000 lawns × 0.8 acres/lawn = 72,000,000 acres.
Now, we convert acres to hectares using the conversion factor:
Total lawn area (hectares) = Total lawn area (acres) × Conversion factor = 72,000,000 acres × 0.4047 hectares/acre = 29,138,400 hectares.
Comparing our result to the options provided, none of them match precisely. It's possible there may have been a calculation or type error in the question. Therefore, none of the options A, B, C, or D are correct based on our calculation.