Book Maths Puzzle Algebra

factor 81x2-49y2=

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A coin collection contains 30 coins in nickels, dimes, and quarters. There are 3 more dimes than nickels. The value of the coins is $3.55. Find the number of quarters in the collec evaluate 3-5\6-2(2)+(4-10)\.............everything is an absolute value except the 3-5 at the beginning....