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Q: Is 15 times pi a rational number?

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No, it is not.

No, it is not.

No, it is not.

It the radius is r then the area is pi*r*r - which is pi times a rational number. pi is an irrational number, so the multiple of pi and a rational number is irrational.

Any multiple of or addition to or subtraction from PI is an irrational number. PI divided by PI is 1, a rational number. So is PI times 0 = 0

No; since pi is irrational if you multiply it by a rational number it is still irrational

3.14 is a rational number pi is not. pi is not 3.14

(pi) itself is an irrational number. The only multiples of it that can be rational are (pi) x (a rational number/pi) .

Well, (pi) x (1/pi) = 1 .

No because the value of pi as regards to a circle is an irrational number

Any number times pi is irrational.

3 times pi is an irrational number because it can't be expressed as a fraction

Pi is irrational.

No because it can't be expessed as a fraction

If you mean 0.3 times pi then it is an irrational number

No, it is not.

No, it is not.

I assume you mean 2 times pi. Since pi is irrational, 2 pi is also irrational.

No.

Minus pi. Or minus pi plus any rational number. Here is how you can figure this out (call your unknown number "x", and let "r" stand for any rational number):x + pi = r To solve for "x", simply subtract pi from both sides. That gives you: x = r - pi

No 22*pi is not a rational number

No. pi/2 is a faction but it is not a rational number.

No 10*pi is not a rational number because it can't be expressed as a fraction

Yes. For example, if you take any truncated equivalent of pi then it will be rational.

It can be rounded to 3.14, this however does not make it a rational number.