1) lim(x->5) = (3x-7) = 8
2) lim(x->2) = (x^2+2 x-1) = 7
3) lim (x->-4) = (5 x+2) = -18
4) lim (x->3) = (2x^2-4 x+5) = 11
5) lim (y->-1) (y^3-2 y^2-4) = -7
6) lim (z->-2) (z^3+8) = 0
7) lim (x->3) (4 x-s)/(5 x-1) = 6/7-s/14
8) lim (x->2) (3 x+4)/(8 x-1) = 2/3
9) lim (t->2) (t^2-5)/(2 t^3+6) = -1/22