which expression would be easier to simplify if you used the associative property to change the grouping? a. (27 + 4.5) + 1.5 b. - 1/2 + {(-5/3) + (-7/3)} c. (3/2 + 5/2 ) + (-1/4) d. 14 + (20 +80)

Rena is building a 1: 180 scale model of a real castle. her model has a rectangular base that is 3 feet wide and 4 feet long what is the area of the base of the actual castle in square feet

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

Construct the graph that models the given situation