Question

The table below shows the square roots of different numbers:


Number
(x) 4 4 9 9
Square root
(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 car for a week and driving it x miles is shown below:

f(x) = 90 + 0.11x

What is the value of f(300), and what does f(300) represent? (5 points)

Answer 1

@Lena772 Hi could you please help me?

Answer 2

do you know what y as a function of x means?

Answer 3

the square root of y is equal to x @dashdg

Answer 4

@dashdg

Answer 5

If y is a function of x, then it should pass the vertical line test (if a graph of y is given). To pass the vertical line test a vertical line drawn at any x should cut the graph at the most one point or not at all. If it cuts the graph at two or more points then it is not a function. What it really means is for any x value there should be at the most just one y-value. If the same x value gives two different y-values then it is NOT a function.
Look at the values in the table. Does the same x give two different y values?