Is 6 a rational or irrational number?

Math it's appreciated. (picture provided)

What is 1/3x5 on anuber line what does it look like on a number line

Gabriel determined that his total cost would be represented by 2.5x + 2y – 2. his sister states that the expression should be x + x + 0.5x + y + y – 2. who is correct? explain.