rall 20 Show all steps in the solutions to the following problems. Insufficient justification will result in a loss of marks. 1. [4 marks] Consider the graph below. For each blank, enter interval(s) or number(s) as appropriate, or enter "none". 3- (a) If the graph represents f(x), use it to approximate the following: 2- (i) Open interval(s) on which f is increasing: (ii) Open interval(s) on which f is decreasing: (iii) Open interval(s) on which f is concave up: 0- 2 CO 5 6 8 (iv) Open interval(s) on which f is concave down: -1- -2 (b) If the graph represents g'(x), use it to approximate the following: (i) Open interval(s) on which g is increasing: (ii) Open interval(s) on which g is decreasing: (iii) Open interval(s) on which g is concave up: (iv) Open interval(s) on which g is concave down