Answer:
Labeling the options from 1 to 5, going from top to bottom , to make the answer more easier to type: 4,5
Explanation:
1) Not rational
Why: Pi is not a rational number
2)Not Rational
Why: 7/9(the sum of to the equation) goes on forever
3)Not Rational
Why: 5√5 or √125(sum of equation) is not a whole number and goes on forever
4)Rational
Why: (√17+12)-(√17-6) = 18, a rational number
You multiply -1 (subtraction signs always
refer to -1 when there is not other in front of
the parenthesis) to √17-6 in order to get rid of
parenthesis
You add the common variables together
√17+12-√17+6=18
the √17s cancel each other out
5)Rational
Why: √2•√2 is √4 which equals to 2,-2, these are rational whole numbers