a) The first answer is wrong. Because the graph is in (0,7).
So it is increasing in (0,1)U(3,7)
Answer of (b) is correct.
c) Concave upward means where it look like U.
That is in (2,4) and (5,7) [blue marked]
Concave downward means where it look like flipped U.
It occurs in (...
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