l. [4 mks} Consider the graph below. For each blank, enter interval(s) or number(s) as appropriate, or enter \"none\". (a) If the graph represents f(:1:), use it to approximate the following: (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: (iv) Open interval(s) on which f is concave down: (b) If the graph represents g'(x), use it to approximate the following: (i) Open imam-51(9) on which 9 is increasing: (ii) Open interval(s) on which 9 is decreasing: (iii) Open inter-RIM on which 9 is concave up: (iv) Open interval(s) on which g is concave down