Question

Which intervals show f(x) increasing? Check all that apply.

[–2.5, –1.6)
[–2, –1]
(–1.6, 0]
[0, 0.8)
(0.8, 2)

Answer 1

The answer is just C and D if your using edgen

Answer 2

The correct options are 3 and 4.

Step-by-step explanation:

From the given graph it is clear that the turning points of the graph are (-1.6,-56), (0.8,11.4) and (2,0).

Using these points we can say that,

1. The given function increasing on
`(-1.6,0.8),(2,\infty)`.

2.The function is decreasing on
`(-\infty,-1.6),(0.8,2)`.

In interval [–2.5, –1.6), the function is decreasing.

In interval [–2, –1], first the function is decreases, after that the function increases.

In interval (–1.6, 0], the function is decreasing.

In interval [0, 0.8), the function is decreasing.

In interval (0.8, 2), the function is decreasing.

Therefore, the correct options are 3 and 4.