Can somebody help me with this, I am on a test.. on math: Which expression has a solution of 56, if r = 8?

options:

1. 8 r
2. 7 r
3. 6 r
4. 9 r

Moira has a canvas that is 8 inches by 10 inches. she wants to paint a line diagonally from the top left corner to the bottom right corner. approximately how long will the diagonal line be?

Charlie tosses five coins.what is the probability that all five coins will land tails up.

Will mark ! (10 points also! ) if x varies inversely with y and x =6 when equals y= 10, find y when x=8 a. y=4.8 b. y=7.5 c. y=40/3 d. y=4/15