exam Maths Puzzle Numerical Ability

An item costs $900, has a scrap value of $50, and a useful life of five years. The linear equation relating book value and number of years is:

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A chemist has 300 milliliters of a solution that is 18% acid. How many milliliters of acid are in the solution? McGraw Hill Beginning Algebra Chapter 6. Thanks so very much for your help!!!!! Rob can tar a roof in nine hours. One day hsi friend Kayla helped him and it only took 4.74 hours. How long would it take Kayla to do it alone?