A box contains $8.15 in nickles, dimes, and quarters. There are 47 coins in all, and the sum
of the number of nickles and dimes is 3 less than
the number of quarters. Define your variables
and then create the three system of equations to
represent this situation.

Could someone with number 1 and 2

What is x3+3x2−16x−48 divided by x−1?

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