20-29 - Using the given functions, find the limits by direct sub- stitution (if possible). Otherwise, indicate whether the limit is infinity or negative infinity. Compute the value of the function 0.1 and 0.01 above and below the limiting value of the argument as a test of whether your answer is correct. 20. lim I(t) where I(t) = 5t + 6. 1- 5 21. lim p(x) where p(x) =x5 + 6x3 + 7. x-2 22. lim f(x) where f(x) = e x-0 x+1 23. lim h(y) where h(y) = y In(y - 1) for y > 1. y- 1+ 24. lim g(z) where g(z) = In(z - 1) for z > 1. 2 - 2 25. lim h(y) where h(y) = y In(y - 1) for y > 1. y- 2 26. lim g(z) where g(z) = In(z - 1) for z> 1. Z - 1 + 27. lim F(t) where F(t) = cos(etz) 1- 2 28. lim r(w) where r(w) = (1 - w)-4. w-> 1 29. lim a(t) where a(t) = 12 if t > 0 and 0 if t