Which of the following numbers is irrational ? ?

Ahiker stands at an unknown elevation before he ascends 2 miles up a mountain to an elevation of 9 miles. find the elevation of the hiker before his ascent.

Gabrielle's age is two times mikhail's age. the sum of their ages is 84. what is mikhail's age?

Afair die is cast four times. calculate the probability of obtaining exactly two 6's round to the nearest tenth of a percent