Question

Which of the following is an irrational number?

Answer 1

https://media.studyisland.com/cgi-bin/mimetex.cgi?3.8

Answer 2

https://media.studyisland.com/cgi-bin/mimetex.cgi? \frac{2}{13}

Answer 3

https://media.studyisland.com/cgi-bin/mimetex.cgi? \sqrt{51}

Answer 4

https://media.studyisland.com/cgi-bin/mimetex.cgi? \sqrt{81}

Answer 5

https://www.google.com/search?q=real+numbers&source=lnms&tbm=isch&sa=X&ei=0K_mUvmWGJLlsASr-oKoAQ&ved=0CAkQ_AUoAQ&biw=1920&bih=979#facrc=_&imgdii=_&imgrc=2E3Xm11PasI5WM%253A%3BS24H-C_xfjYcUM%3Bhttp%253A%252F%252Fscimathmn.org%252Fstemtc%252Fsites%252Fdefault%252Ffiles%252Fimages%252Fframeworks%252Fmath%252F8.1.1A%252Fimage131.jpg%3Bhttp%253A%252F%252Fscimathmn.org%252Fstemtc%252Fframeworks%252F811a-rational-irrational-real-numbers%3B866%3B386

Answer 6

https://www.google.com/search?q=real+numbers&source=lnms&tbm=isch&sa=X&ei=0K_mUvmWGJLlsASr-oKoAQ&ved=0CAkQ_AUoAQ&biw=1920&bih=979#facrc=_&imgdii=_&imgrc=2E3Xm11PasI5WM%253A%3BS24H-C_xfjYcUM%3Bhttp%253A%252F%252Fscimathmn.org%252Fstemtc%252Fsites%252Fdefault%252Ffiles%252Fimages%252Fframeworks%252Fmath%252F8.1.1A%252Fimage131.jpg%3Bhttp%253A%252F%252Fscimathmn.org%252Fstemtc%252Fframeworks%252F811a-rational-irrational-real-numbers%3B866%3B386

Answer 7

so d

Answer 8

@SolomonZelman is it d

Answer 9

38 19
3.8= --- =----- it is rational
10 5

2/13 is rational too

sqrt(81)=sqrt(9^2)=9 =9/1 so it is rational

Answer 10

sqrt(51)=is not rational