The table below shows the outputs y for different inputs x:
input
(x) 1 1 3 3
output
(y) 4 2 12 6
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 paddleboat for x hours is shown below:
f(x) = 20 + 10x
what is the value of f(120), and what does f(120) represent? (5 points

Part A:

We usually take the input variable as 'x' and the output variable as 'y'.

In the given table, we can see that 1 is the input value corresponding to 4 and 2 both.

i.e.  one input value corresponds to two different output values that contradicts the definition of the function.

Thus  the given table doesn't represent any function.

Part B: Given : The total cost f(x), in dollars, for renting a paddle-boat for x hours is shown below:

At x= 120 ,  

It represents that the total cost  for renting a paddle-boat for 120 hours is $1220.

the answer is 13

step-by-step explanation:

5*5=25

12*12=144

25+144=169

169^2=13

the correct answer is c