Someone give me anime recommendations :)

Which expression is equivalent to 2x^2+2x-4/2x^2-4x+2

Determine the mean and variance of the random variable with the following probability mass function. f(x)=( 729divided by 91) (1 divided by 9) superscript x baseline comma x equals 1,2,3 round your answers to three decimal places (e.g. 98.765).

What are the soultion(s) to the quadratic equation 40- x^2=0