II. Section 1. 6 . INIP O RIAN'T : When you do these problems , it is not sufficient to simply find the critical number . You must then use the techniques from Sections 1. 9/ 1. 3 to show that the critical number gives a global maximum or global minimum value for the function on its domain . 1 . Find the global extreme of the following functions on the given closed interval . ( a) f(2 ) = 213 - 21 2 - 121 01 [ - 2 , 1) (b) f (2 ) = 2 1 - 313 01 \\ - 1 , 8\\ ( c ) flaj = sill It cost ! . on\\ U , IT\\ Hint for ( 1 ) " 2. A rancher wishes to enclose a rectangular pasture with 320 feet of fencing . The fencing* will be used on three sides of the pasture , and the fourth side of the pasture will be bounded by a wall . What dimensions should the pasture have in order to maximize it's arca !" 3. If CITY is the total cost incurred in producing I units of a certain commodity , then the average cost of producing I units of the commodity is given by ( I )0 for I . O. "The total monthly cost ( in dollars ; incurred by Cannon Precision Instruments for producing I units of the model All camera is given by Cluj = 0.0OZZI + 802 + 10, 0.010 . How many cameras should Cannon produce in a month in order to have the lowest Dogsible average monthly cost &quot