Yes this is a function of x. Specifically the function is f(x) = x^2 The inputs (x) are squared to get the outputs (y). For example, f(x) = x^2 f(-3) = (-3)^2 <<--- input is x = -3 f(-3) = 9 <<--- output is 9 The pair of values -3 and 9 are shown in the table (column on the very right side)
The fact that each input leads to exactly one output is what makes this a function. If we had an input lead to multiple outputs, then it wouldn't be a function.
Replace every x with 150 and then use the order of operations PEMDAS to simplify
f(x) = 20+3x f(x) = 20+3*x f(150) = 20+3*150 <<--- x has been replaced with 150 f(150) = 20+300 f(150) = 320 So the value of f(150) is 320 The input is 20 The output is 320 x is the number of hours y or f(x) is the total cost
So this means f(150) = 320 represents the idea that 150 hours of renting the rowboat leads to a total cost of $320
