B because for it to be a function one X value cant have more than one Y value and B is the only one that follows the rule
F(x) = 2x^2 + 5x
f(3b) = 2(3b)^2 + 5(3b) = 2(9b^2) + 15b = 18b^2 + 15b
√(1/121) = √1 / √121 = 1 / 11 = <em>11⁻¹</em>
306 / 3.6 = 85 gallons per minute
5,200 = 85x
x = <span>61.1764705882
hope this helps</span>
