20pens cost #300 and 50pens cost #750 (a)is the cost of pens directly proportional to the number of pens?

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).

School has 204 sixth grade students. if the sixth grade is 30% of the total school, how many students are in the middle school?

On a piece of paper graft y+2> -3x-3 then determine which answer matches the graph you drew