Answer this i suck at math
which of the following is a valid reason why the quadrilateral shown below is a parallelogram?
a. both pairs of opposite sides are parallel
b. all pairs of consecutive angles are supplementary
c. all pairs of consecutive angles are
d. both pairs pf opposite sides are congruent

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

Atransformation t : (x, y) (x-5,y +3) the image of a(2,-1) is

Find the rate of change for the situation. you run 7 miles in one hour and 21 miles in three hours.