b. d. 21. Given the functions f(x) = 46 - and g(x) = x* + 7x, which expression is equal to g ( /(x) ) ? a (x2 + 71)46-x C. x4 - 6x +6 b. d. 6-x+7-46-x 22. For the function h(x) = (7 - x)', which are possible functions fand g so that h(x) = f(=(x))? a. f(x ) = ] - x b. 1x ) = x Ofx) = x d. fx) = 7 -x g ( x ) = & 8 ( x ) = 7 -X2 g ( x) - 7 - x 1Y = [1)8 23. The function h(x) = =(/(x)) is the composite of f(x) = x and g(x) = =_ . Which is an explicit equation for h(x), and what are the restrictions on x? a. h(x ) = ( 7 - 6) : C. h( x ) = - x2 - 6 * 46 b. h(x) = d. 1 (x - 6)2 72 - 6 X>6 * * - /6 and x * 46 24. Which exponential function is increasing? a. y = 0.17 7 = 0.137 b. V = 25. Which exponential function is decreasing? a. y = 5.37 C . " - 181 = 1 18333