So, first off it would help if you could define the terms irrational number and integer. Well, an irrational number is basically any real number that can't be expressed as a ratio of integers. They also cannot be represented by terminating or continuing decimals. And an integer is pretty much any number that cannot be written as a fraction or decimal, such as -2, 13, 257. It is not 2 and 1/2, or 4.75. Those would not be integers. Do you think you can figure out the difference?
Step-by-step explanation:

It represents the ounces of water that the bottle can still hold.
Answer:
2x+8
Step-by-step explanation:
2 times x = 2x. 2 times 4 = 8.