4, because you can't have a negative square root.
Answer:
The first one
Step-by-step explanation:
In mathematics, the term linear function refers to two distinct but related notions: In calculus and related areas, a linear function is a function whose graph is a straight line, that is, a polynomial function of degree zero or one. So going in that order gives you a linear function.
Divide the numbers by (prime) numbers. The numbers should both be divisible by the (prime) numbers