Question

The table below shows the fourth roots of different numbers: Number (x) 16,16,81,81 Fourth root of the number (y) 2 −2 3 −3 Part A: Does the table represent y as a function of x? Justify your answer. (5 points)
Part B: The total cost f(x), in dollars, for renting a truck for x hours is shown below:

f(x) = 25x + 16

What is the value of f(20) and what does f(20) represent? (5 points)
Will mark brainlyest

Answer 1

Part A) Y cannot be described as a function of x, because in order to be a function, there can only be one input, the x value, for every output, f(x) or the y value. Since the x value, 16, generates two y values, -2 and 2, this cannot be called a function. 

Part B) 
f(x) = 25x + 16
f(20)= 25(20) + 16
f(20) = 500 + 16
f(20) = 516

This is the total cost, in dollars, of renting the truck for 20 hours. 

Answer 2

A: The table does represent y as the table is x as a function for why to the answer to part A is no. X in this case is depending on what y is.

B: f(20)= 25(20)+16

F(20)=500+16
F(20)= 516

The value f(20) let’s you know what you plug in for x.