A semicolon is used to separate variables from parameters. that we are defining a function of the parameters that returns a function of the variables.
A. w= -22 so A has a negative solution.
D doesn't have a variable so I'm not sure about it (did you type it correctly?), but because only one side of the equation has a negative number, I'm guessing D is also a negative solution
900,000,000. move the decimal until you have a number between 1-10 so move it 8 times and you'll have 9×10^8
Idk what unit it is but it’s 80 cubic inches/feet/centimetres