PlEASE HELP MEE (and plzz no links they dont work for mee.)

The figure above shows the lengths of thesides of a rectangle in cm. find the valuesof x and y and then the area of the rectangle. sides: top= 3x - yleft= 3y + 4bottom= 2x + yright= 2x - 3 use both methods, elimination and substitution, if possible.

If f(x)=x^3 and g(x)=2x+7 when g(x)=-5

What situation is an example of an observational study