Gurmit wanted to perform activity 16.8 using a laser torch. Her teacher advised her not to do so.Can you explain the basis of the teacher 's advise ?

The teacher distributes 5 pencils per student. Can you tell how many pencils are needed, given the number of students? (Use s for the number of students.)

Kurthi said sqrt2 can be written (sqrt2)/(1) which is in (p)/(q) form. So sqrt2 is a rational number. Do you agree with her argument?