10 a) The price of a visit to the dentist is $50. If the dentist fills any cavities, an additional charge of $80 per cavity gets added to the bill. If the dentist finds any number of cavities (n), what will the cost of the visit be? Write your answer as an expression. (1 mark)

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

If you have 12 feet of string and you cut it into equal length of 5 inches each how much string will be left

In the diagram, ab is tangent to c, ab = 4 inches, and ad = 2 inches. find the radius of the circle.