No, 8.5 is a rational number. A rational number is defined as any number that can be expressed as a fraction. 8.5 can be expressed as 8 1/2 or 17/2.
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Pi is an irrational number. That means that it never stops and will never repeat itself. The first 85 decimals without rounding are 3.1415926535897932384626433832795028841971693993751058209749445923078164062862089986280...
No. The sum of an irrational number and any other [real] number is irrational.
A negative irrational number can be thought of as an irrational number multiplied by -1, or an irrational number with a minus sign in front of it.
If an irrational number is added to, (or multiplied by) a rational number, the result will always be an irrational number.
Any irrational number will, eg √2, π, e.