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
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) <span>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. </span>
It starts with 200 so that is by itself. The m is added to the number that is changing every so often, in this case $50 a month. They need more than $1,250 so we use the greater than sign.
