the following exercises, use direct substitution to show that each limit leads to the indeterminate form 0 /0. Then, valuate the limit. 93. lim - -16 94. lim *-2 x-2 x2 -2x 95. lim 3x-18 x-6 2x-12 96. lim (1th) 2-1 h-0 h 97. lim t-9 t-+9 vt-3 98. lim ath h-0 h , where a is a non-zero real-valued constant