Answer:
A. The number 81 is a rational number.
B. 11.7 is irrational
C. 3 is irrational
E. 17.35 is rational
Step-by-step explanation: A rational number is a number that can be expressed as a fraction where the numerator is a whole number (integer) and the denominator is a whole number (integer).
The number 81 is a rational number. We know this because it is possible to obtain the rational number 81 by dividing the integer 81 by the integer 1.
2/5 and 2/3 are rational numbers. Irrational numbers have an infinite number of digits to the right of the decimal point, without repetition.
The square root of 3 is irrational. It cannot be simplified further in its radical form and hence it is considered as a surd.