The amount of matter an object has is called it's mass.
Mass does not depend on gravity, so the mass ALWAYS stays the same.
It should be 18, because despite of 3,14, because that's pi and radius is half of the diameter, so36 divide 2 is 18.
The answer is line c, because you have to rise 5 and run 2.
First you need to add the prices to get 85.55. Then 100 - 85.55 is 14.45.
She will have $14.45 leftover
