(1 point) A function is said to have a horizontal asymptote if either the limit at infinity exists or the limit at negative infinity exists. Show that each of the following functions has a horizontal asymptote by calculating the given limit. 8x lim 8 + X-+ 00 x2 - 4x + 8 5- 3x 8x- + 10 lim + X - -00 7+x (10x - 8)2 8x + 10 12x OC lim X- -00 x - 5 -x - 15 lim x' + 10x - 14 - x = X-+00 lim x + 10x - 14 + x = X- -00