Please tell me how to solve below questions

Please refer to the attached graph

Question 1

f has 2 critical values. Approximate the smaller of the 2 critical values.

(numerical value rounding to the nearest tenth)

Question 2

Approximate the larger of the 2 critical values

(numerical value rounding to the nearest tenth)

Question 3

Create the number line for determining where f is increasing and decreasing. Classify each sub-interval below

(-infinity, -1.2) --- increase or decrease

(-1.2, 1) --- increase or decrease

(1, infinity) --- increase or decrease