How much longer is a 1 inch button than a 3/8 inch button

What is the point-slope equation of a line with slope -5 that contains the point (6,3)

Antonio made a scale model of a building. the model's scale is 1 inch to 235 feet and its height is 3.5 inches. what is the exact height of the actual building? enter your answer in the box.

The parabola opens: y=√x-4 (principal square root) up down right left