Weight*Height
Mass*9.8*Height
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GPE = mass * acceleration of gravity * height. Original GPE : m*g*h Joules if you double the height, you get m*g*2h Joules, or 2*m*g*h -- twice the GPE.
Four and half
GPE = Mass * Height so Mass = GPE/Height
A system of equations is a set of equations with more than one variable dealing with the same material. If there are 2 variables, then the system must have 2 equations before it can be solved. 3 variables need 3 equations, etc.
The following equations will give you the number 242: 121 x 2 484/2 240 + 2 244 - 2