Which number is most likely an irrational number?

-9.121212121...
-1.500000000...
-5.690134489...
-7.855555555...

Which of the following is true for the relation f(x)=2x^2+1

The boiling point of water at an elevation of 0 feet is 212 degrees fahrenheit (°f). for every 1,000 feet of increase in elevation, the boiling point of water decreases by about 2°f. which of the following represents this relationship if b is the boiling point of water at an elevation of e thousand feet? a) e = 2b - 212 b) b = 2e - 212 c) e = -2b + 212 d) b = -2e + 212

Micheal is 4 times as old as brandon and is also 27 years older than brandon. how old is micheal