Winnie used her calculator to calculate the square root of a number. She then found
the square root of the number displayed.
The calculator then showed 3. What
number did Winnie first enter into her
calculator? Explain your reasoning.

Solve for x by completing the square. 2x^2-4x+7=0

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

Is the point (0, 8) on the x-axis or y-axis? how do you know?