Me with these questions i have 12 questions and will reward anyone who me with them all this is 10/12

Solve the system of equations. y= 2x y= x^2 - 15

Jacks bank statement shows an account balance of -$25.50. which describes the magnitude, of size, of the debt in dollars

Apinhole camera is made out of a light-tight box with a piece of film attached to one side and pinhole on the opposite side. the optimum diameter d(in millimeters) of the pinhole can be modeled by d=1.9[ (5.5 x 10^-4) l) ] ^1/2, where l is the length of the camera box (in millimeters). what is the optimum diameter for a pinhole camera if the camera box has a length of 10 centimeters