PLEASE ANSWER ASAP!!!!

1. In the month of October, the population of a species of fish in a river increased by a factor of 1.05 every day. The function below shows the number of fish in the river f(x) after x days:

f(x) = 100(1.05)^x

Which of the following is a reasonable domain for the function?

0 ≤ x ≤ 100
0 ≤ x ≤ 31
All positive integers greater than 100
All positive integers less than 100

2. An expression is shown below:

square root of 18 plus square root of 2

Which statement is true about the expression?

It is rational and equal to 3.
It is rational and equal to 4.
It is irrational and equal to 3 multiplied by the square root of 2.
It is irrational and equal to 4 multiplied by the square root of 2.