State three mistakes Graham has made when plotting his cumulative frequency diagram.

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).

Aquadratic equation in standard from is written ax^2= bx+c, where a,b and c are real numbers and a is not zero?

Can someone me with #s 8, 9, and 11. with just one of the three also works. prove using only trig identities.