Question

Which of the following is rational number?
a.) π
b.) 1.425
c.) √50
d.)√-4

Answer 1

1.425 because it can be represented as:

1425/1000

A rational number is any number that can be expressed as ratio of two integers...

Answer 2

b is the only rational number

a) pi is irrational because it continues without repeating
c) sqrt 50 is irrational because it is the square root of a non perfect square
d) sqrt -4 is an imaginary number because when you take the square root of a negative you get and answer with i in it.