What must be done to the wires used to make an electromagnet before they connect A. The terminals of the battery must be coated with an insulating material
B. The wires must be rubbed with sandpaper to make their surfaces rough
C. The ends must be marked to show which end to attach to each terminal of the battery
D. The insulation must be removed from the ends of the wires

Step-by-step explanation:

To create a simple electromagnet, you'll need a source of electricity, a conductor, and metal. Wrap insulated copper wire tightly around an iron screw or nail before connecting the wire to a battery, and watch as your new electromagnet picks up small metal objects.

a. the are of the rectangle is 18.25

b. 18.25 times two is 36.50

rae me : d

definitely a. the others have almost all data points on one side of the line.

step-by-step explanation: