12. On Saturday, Mrs. Armour bought 7 pairs of socks for $3 each, and a
sweater for her dog for $12. Then she found a $5 bill on the sidewalk.
Over the course of Saturday, what was the change in the amount of
money Mrs. Armour had?

Solve the following inequalities and show the solution on a number line. 3/4 (2x-7) ≤ 5

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

Astudent has created the give circuit diagram. it consists of a battery, a resistor, and a light bulb. in one minute, 1.2c of charge flows through the resistor. how much charge flows through the light bulb in one minute?