21. An economist wishes to estimate, to within with % confidence, the mean amount spent annually by American households on clothing. Assuming the standard deviation of the amount spent is $175, the minimum sample size needed is about : (a) 33 (b) 62 (c) 39 ( ) 84 ( e) 48

A. plot the data for the functions f(x) and g(x) on a grid and connect the points. x -2 -1 0 1 2 f(x) 1/9 1/3 1 3 9 x -2 -1 0 1 2 g(x) -4 -2 0 2 4 b. which function could be described as exponential and which as linear? explain. c. if the functions continue with the same pattern, will the function values ever be equal? if so, give estimates for the value of x that will make the function values equals. if not, explain why the function values will never be equal.