exam Maths Puzzle Numerical Ability

Jon buys a new truck for $42700. The car depreciates by 19&1/2% annually. What is the common ratio for the value of the truck in successive years??? I think the 0.805 ?????????????

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exam Other Question

A. Solve the following quadratic equations. Make sure to show all your work. Do not use any method (e.g., factoring, completing the square, quadratic formula, graphing) more simplify (2x^4+3x^3y^2+x^3y)+(x^2y)

i divided everything by the (x^2y) and i came up with 2x^2+3xy+x
but since it looks like an addition problem im not sure how to work it out