Which binomials are a difference of squares?

Choose exactly two correct answers.

c3 – 1

4p2 – 9

d2 + 4

q2 – 36

The heaviest 16% of all men in weight weigh more than how many pounds ?

Abcd is a square. what is the measure of angle bac

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