Ineed this fast
zach has 48 silver dollars. zach's sister has s more silver dollars than zach.

choose the expression that shows how many silver dollars zach's sister has.
a) x = 48 - s

b) x = 48 + s

c) x = s - 48

d) x + s = 48

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).

You are cycling around europe with friends. a cycling festival is starting soon in barcelona. it will take 4.5 hours to cycle there. how many minutes in total is this?

Ellen makes and sells bookmarks. she graphs the number of bookmarks sold compared to the total money earned. why is the rate of change for the function graphed to the left?