What’s a good fraction calculator on chrome that can do fractions devided by whole numbers? I want to use it to practice my fractions and memorize them

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).

Simplify. 4+3/7x-2-2/7x a. 2-5/7x b. 6-1/7x c. 2+1/7x d. 6+5/7x

Aline passes through the point (–7, 5) and has a slope of 1/2 which is another point that the line passes through?