OG详解-OG10 数学2 Q9

Choice D is correct. It’s given that the function f(x) = 8x+4 gives the estimated height, in feet, of a willow tree x years after its height was first measured. For a function defined by an equation of the form f(x) = mx+b, where m and b are constants, b represents the value of f(x) when x = 0. It follows that in the given function, 4 represents the value of f(x) when x = 0. Therefore, the best interpretation of 4 in this context is that the estimated height of the tree was 4 feet when it was first measured.
Choice A is incorrect and may result from conceptual errors. Choice B is incorrect and may result from conceptual errors. Choice C is incorrect and may result from conceptual errors.