In 36 years, ishaan will be 3 times as old as he is right now. how old is he right now?

Years + 36 = years * 3 
subtract years from both sides 

36 = 2 * years 

divide by 2 

18 = years

The distance from point a to point c across the coordinate plane is aproxamatly 8.94 rounded to the nearest hundredth. you use a^2 + b^2 =c^2

The first one, i believe, would be correct. all the others have one thing in common, and that's that they have repeating numbers. in the second one, x and y have repeating 6's and 3's, and in the third, x and y have repeating 6's as well. in the last one, there are repeating 3's. the first one has no repeating numbers.