Answer:
B) Aluminum and steel are good conductors of electricity.
Step-by-step explanation:
The midpoint of (x1,y1) and (x2,y2) is

just average them
(4,1) and (-2,4)
the midpoint is

(1,-1.5)
The answer is 80, 2x+3x+4x=180, so x=20. 20*4=80.
Answer:
970
Step-by-step explanation: