Book Maths Puzzle Profit and Loss

Each year a car depreciates to about 0.8 of its value teh year before. What was the original value of a car that is worth $16,000 at the end of 3 years?

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Book Other Question

how do i translate the phrase into an algebraic expression. Let x represent the real number. ten decreased by the quotient of a number and 2?
the absolute value of the sum of a
how do i solve these equations and check my solution?
12y+72=0
-7x+21=0