Which of the following is not a polynomial identity?
a. a^3-b^2= (a-b)(a^2+ab+b^2)
b. (a+b)^2= a^2+2ab+b^2
c. a^2(b+c)= a^3(b/a+c)
d. (a^2+b^2)(c^2+d^2)=(ac-bd)^2+(ad+bc )^2

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)

Which are the possible side lengths of a triangle?

Can someone tell me if these are correct?