15 + ax/5=10 solve for x

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).

Bring the fraction a/a-4 to a denominator of 16-a^2

What is the unit rate of, 75% high fiber chimp food to 25% high protein chimp food.