If a table seats 7, what is the least number of tables needed to seat 155 people

Simplify the expression and find the missing terms. the simplest form of has in the numerator and in the denominator.

An angle that measures between 90 and 180° is called a(,

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