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4 parts following these instructions Find the critical numbers for f and the open intervals on...

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Basic Math

4 parts following these instructions

Find the critical numbers for f and the open intervals on whichf is increasing (decreasing)

For the first question, your answer should be a comma-separatedlist of x values or the word \"none\". For the other two, your answershould either be a single interval, such as (0,1), acomma-separated list of intervals, such as (-inf, 2), (3,4), or theword \"none\".

answeres needed for each part

1.  The critical numbers for f are
2.  f is increasing on the intervals
3.  f is decreasing on the intervals

part 1)

Let f(x)=18+3x−x^2

part 2)

let f(x)= 5+2x-x^3

part 3)

let f(x)=6x-6

part 4)

let f(x)= 6x^2-8x^4

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