Answer:
Last option
(AB)^2+(BC)^2=(AC)^2
Step-by-step explanation:
REASON because it follows Pythagoras theorem
8.1x - 4.5y = 5.4.....subtract 8.1x from both sides
-4.5y = -8.1x + 5.4...divide both sides by -4.5
y = (- 8.1/-4.5)x + 5.4 / -4.5...simplify
y = 1.8x - 1.2 <==
A scaled triangle because they are all different lengths
Answer: A≈12.57mi²
Step-by-step explanation: