For b), and c), it should be easy. Each is a fraction, the numerator is fixed and the denominator gets larger as n gets larger. The limit is obviously 0 for all x.
For a), look at an example. Suppose x= .6. Then, according to my calculator, , , , , ..., , .
Can you guess what the limit will be? Can you see why that must be true?
To decide whether converge is uniform, think about how you would prove the pointwise limit. Given , you must find such that... Given a specific does depend on the value of x or not? If no, then convergence is uniform.