Theoretical because they haven’t tested it yet that is just their hypothesis
y+43°= 180°( straight angle)
=>y= 180°-43°
=>y=137°
A shelled, water-retaining egg with four membranes that enables reptiles, birds, and egg-laying mammals to complete their life cycles on dry land.
Answer:
x=3
Step-by-step explanation:
-2x+3=x-6
-3x+3=-6
-3x=-9
-x=-3
x=3