## anonymous one year ago help please! 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)

1. Michele_Laino

hint: the point x=4 has two images, namely +2 and -2, similarly for point x=9 what can you conclude?

2. anonymous

it is not a function?

3. Michele_Laino

correct!

4. anonymous

oh so that would be the answer to part a!? thats so much simpler than i thought

5. anonymous

now i don't understand where f(300) comes into play?

6. Michele_Laino

yes! since your function, doesn't check the general definition of a function

7. Michele_Laino

it is simple, we have to replace x with 300, so we have to compute this: $\Large f\left( {300} \right) = 90 + 0.11 \cdot 300 = ...?$

8. anonymous

oh so that would equal 123?

9. Michele_Laino

correct!

10. anonymous

but what does it represent?

11. Michele_Laino

it is represent the image of the point x=300, by means of your function: |dw:1441637275979:dw|

12. Michele_Laino

oops..it represents...

13. anonymous

ooh i think i see, alright thank you so much for your help! @Michele_Laino

14. Michele_Laino

:)