Which expression is equivalent to 2√25y^8x4√6y^3 if y > 0

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).

One card is dealt from a 52 card deck. find the probability that the dealt card is a 4 or a black 7

Evaluate the expression. (9 + 5)(3 + 2)0