I need help on questions 13, 14, 17, 18, 19, 20, 22, and 23.

LIMITS - Involving Infinity and More Optional:6, 11, 15, 16, 21 Work the following on your own paper. Do NOT use a calculator. Show all work.On problems 13 - 18: (a) find lim f(x) (b) find lim f(x) (c) identify all horizontal asymptotes. X-+00 X--00 13. f(x) = 3x3-x+1 14. f (x) = 4x2-3x+5 15. f (x) = 3x+1 x+3 2x3+x-1 x-4 16. f (x) = 3x+1 Hint on 16: Use the definition of absolute value; (x| = (x if x 2 0 Ixl+2 x if x