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I have gotten 2 different answers from the tutors. I need a mathematical way to do part b. The domain and range of the function

I have gotten 2 different answers from the tutors. I need a mathematical way to do part b.

The domain and range of the function n(x) are [-6,9] and [-8,10], respectively. Additionally, n is increasing on the intervals [-6,1] and [5,9) and decreasing on the interval [1,5]. Let q(x) = 4 - 2n(5-x)

a) Find the domain and the range of q(x).

b) On what intervals is q increasing and decreasing?

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