In C=A+B , what is the value of the entry represented by ?
HELP

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).

Solve 4 ln x=2ln25 a) x=5 b) x=25 c) x=625

Find the value of x. also give me an explanation so i can complete it to other questions as well, : )