Marissa found a shirt that had a 20% markdown on it if the price of the shirt is represented by x how much does the shirt cost excluding tax select all that apply
select all that apply
a. 0.20x
b.0.80x
c. x-0.20
d. x-0.80x
e. x(0.2+1.00)
f. x(1.00-0.20)

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