Answer:
Given function:
A. The domain is all positive integers (number of people can't be negative), so as the range.
B. x = 19.2
- f(19.2) = 2.8(19.2)² = 1032.192 tons
C. f(x) = 655432
- 2.8x² = 655432
- x² = 655432 /2.8
- x² = 234082.857143
- x = √234082.857143
- x = 483.821100349 million
D. x = 7530
- f(7530) = 2.8(7530)² = 158762520 tons
