calculate x ?

Answer the following questions in short: If X follows a symmetric binomial distribution with n = 36, calculate E [X(X -1)].

Calculate: 5x+3x

Calculate: -7x-2x+5x

How to calculate sin 4x?

Calculate : lim_( x -> 0 ) x/( 3- sqrt( x + 9 )

Let's calculate mentally :- 5x + 3x

Let's calculate mentally :- -10x - 2x

If ! = ÷, ^=x, #=+, calculate the value of 32!4^7#5 ?​.

Let's calculate mentally :- -7x -2x +5x