math
posted by angela .
a new automobile depreciated 20% of its value after 1 year. if the automobile is priced at $18,000 after 1 year, what was its cost when it was new?

0.8x = 18,000
Solve for x. 
What is x?

x = cost when new

how do you put it in a sequence

0.8x = 18,000
x = 18,000/0.8
x = 22,500 
Would this be a arithmetic sequence

No. I don't know what a sequence has to do with your original problem.
Please explain. 
Can you write it in a sentence

When the car was new, it cost $22,500.
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