Sure, what is the question.
Answer:
4k+11 is the answer
Step-by-step explanation:
7k-3k =4k
4k+11!
I don't know about the first one but for the second one:

Answer:

Step-by-step explanation:
To add fractions <em>with the same denominator</em>, simply add the numerators:

So:

Generally we use n as a counter and begin it with 1: the first term is obtained when n = 1. Thus, n must be a positive integer, 1 or greater: {1, 2, 3, ... }.