Use the function f(x) = 15x¹6 — 16x¹5 to answer the following questions (a) Find the interval(s) on which f(x) is increasing. Number of increasing intervals: | 2 f(x) is increasing on x = ( )U( (b) Find the interval(s) on which f(x) is decreasing. Number of decreasing intervals: 2 f(x) is decreasing on x = ( )U( (c) Find the interval(s) on which f(x) is concave up. Number of concave up intervals: [ 2▼ f(x) is concave up on 9 9

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Q: 13. Σ n-2 -1. In n

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