Answer:
+2,500
Step-by-step explanation:
Since sea level is the 0 in the problem, 2500 above 0 is +2,500
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-2(3a-b)= c
distribute
-6a +2b =c
add 6a to each side
2b = c+6a
divide by 2
b = c/2 + 3a
Answer: c
150 in^2