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)

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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)

Mathematics
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hint: the point x=4 has two images, namely +2 and -2, similarly for point x=9 what can you conclude?
it is not a function?
correct!

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oh so that would be the answer to part a!? thats so much simpler than i thought
now i don't understand where f(300) comes into play?
yes! since your function, doesn't check the general definition of a function
it is simple, we have to replace x with 300, so we have to compute this: \[\Large f\left( {300} \right) = 90 + 0.11 \cdot 300 = ...?\]
oh so that would equal 123?
correct!
but what does it represent?
it is represent the image of the point x=300, by means of your function: |dw:1441637275979:dw|
oops..it represents...
ooh i think i see, alright thank you so much for your help! @Michele_Laino
:)

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