How do you know if an number composite or not

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.

Solutions for 2x+7 less than or equal to 3x-5

The number of fish in a lake can be modeled by the exponential regression equation y=14.08 x 2.08^x where x represents the year