12. Which functions are continuous at x = -5? Select all that apply. (2 points) X- - 25 Of (x) = x+5 if x *-5 0 if x =-5 x- - 25 Of (x) = if x *-5 x+5 -10 if x =-5 x- +10x +25 Of (x) = if x *-5 x +5 0 if x =-5 x +10x +25 Of (x) = if x *-5 x+5 25 if x =-5 13. Write the expression as a single logarithm. (1 point) 18 -log(x+y) --log(x->) O-log(xty)? -1 log(x+ y)' Olog (x ty )2 (x-y)" (xty) Olog ( x ->)214. Find the zero or zeroes of the function f (x) =log,(4x+3) +log,(x-2). (1 point) O x= 5+V/137 8 Ox= -3 and x = 2 4 O x= 5+ V137 8 Ox = 2 15. Identify the focus and directrix of the parabola represented by the equation (x-3) =-4(x+3). The focus is (3,-3) and the directrix is y = -2. The focus is (3,-4) and the directrix is y = -2. The focus is (-3, 3) and the directrix is x = -2. The focus is (-4,3) and the directrix is x = -2. 16. Which conic section is represented by the equation 3x2 -6x- y+5=0? (1 point) Oparabola Ocircle Oellipse hyperbola17. What are the vertices of the hyperbola given by () -2) (x+5)2 = 1? ( point) 25 9 O (0,2) and (-10, 2) O (-3,2) and (-7,2) O (-5,7) and (-5,-3) O (-5,5) and (-5,-1) 18. The equation of a circle in general form is x2+y +4x-6y+9=0. (1 point) What are the center and radius of the circle? Ocenter: (-2, 3) , r = 3 Ocenter: (-2, 3) , r = 2 Ocenter: (-2,-3) , r = 3 Ocenter: (-2,-3) , r = 2 19. Solve 21ex -6 = 5e* for x. (1 point) OIn WIN OIn DO | W Oln -JI W Ono solution