Find each of the following limits that exist. If a limit does not exist, you must clearly justify your answer!! Show your work on separate sheets of paper.

14) lim 7+x-3 15) limx cos x-2 x-2 x->0 10 10 16) limx2 cos 10 17) lim x cos x->0 TX x-700 TX 18) lim 3x2 -7x x-> 00 5x3 - 2x+7 19) lim x2 + x+1+x x->-00