Can y'all help me please, thanks

Which expression is rational? 6. , square root two, square root 14, square root 49

Which expression do you get when you eliminate the negative exponents of 4a^2 b^216a^-3 b

Given a binomial distribution variable with n=20 and p=0.60 find the following possibilities using the binomial table a) p(x < 13) b) p x > 15) c) p(x = 17) d) p(11 < x < 14) e) p(11 < x < 14)