Find the variance and standard deviation for the number of sixes you get when rolling each number cubes

Find the variance and standard deviation for the number of sixes you get when rolling each number cubes

Um... I don't get it?

Solve the problem of combined variations using a constant of variation. If x varies directly as y and z and inversely as the square of r and x=12 when y=2, z=4 and r=2 find x when y=4, z=32 and r=8...

Suppose that Q varies directly with x and inversely with y.

The question is here in the link: http://postimg.org/image/6uq9f3opn/ The last step I could get was: Let K1 and K2 Be constant Z = 1.25(K1)(X ) + 0.64(K2)(Y2) ....

if x varies directly as y, and x=28 when y=4, find x when y=9

if y=45 when x=3, find y when x is 5 I need help solving this

I have a story problem that involves using variation and functions, and I don't even know where to begin or how to read this problem. Could you walk through setting it up and solving it please! Thank...