Question

Which of the following numbers is irrational?

a fraction with numerator negative 15 and denominator 4, a fraction with numerator negative 7 and denominator 9, square root of 4, π

a fraction with numerator negative 15 and denominator 4
a fraction with numerator negative 7 and denominator 9
square root of 4
π

Answer 1

Which numbers do you see can be written as a rational number?

Answer 2

try to use process of elimination, you now some are rational

Answer 3

*know

Answer 4

is pi irrational? d?

Answer 5

rational numbers can be written as a fraction.
pi is irrational (intuitively, it has infinitely many non-repeating digits), the real proof is hard