I am not irrational, my opposite is a natural number, I am not a whole number, I am greater than 13-, What number am I?

Ineed i been stuck on this question since yesterday

The multiplicative property of equality states that for real numbers a, b, c, and d, if a = b and c = d, then ac = bd. true false

When you have 25 numbers, and jake picks 3 random numbers and puts them back, what is the chance bob has of picking those 3 numbers when he picks 6 random numbers (without putting them back)? explain.