Eric practiced piano and guitar for a total of 8 hours this week he practice the piano for 1/4 of that week how many hours did eric participate in the piano this week

Use the distributive law to multiply. 3(4x + 5y + 6)

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

How many verticies does a triangular prims have