What is a better deal

$23 for 10 lb or $32.05 for 15 lb

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).

The suare root of 9x plus 7 plus the square rot of 2x equall to 7

When 142 is added to a number the result is 64 more then 3 times the number. option 35 37 39 41