Explanation:
we need to find the value of x for which C(x) = 2200.
2200 = 270ln(x + 1) + 1900
300 = 270ln(x + 1)
300/270 = ln(x + 1)
10/9 = ln(x + 1)
e^(10/9) = x + 1
x = e^(10/9) - 1 = 2.037731778... ≈ 2.0 acres
for an average intake of 2200 calories per day the number of acres of land owned is approximately 2.0.