Answer:
c
Step-by-step explanation:
this is only if you're talking about density curves, which i assume you are.
4+ x = 3
4 + x = 3 (subtract 4 from both sides)
x = -1 (multiply both sides by 2)
x = -2
400,000 + 30,000 + 2,000 + 300 + 10 + 1