exam Maths Puzzle Numerical Ability

how to solve radicals equations involving roots

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Problem Solving With Systems of A line: How to Solve
Suppose you have 10 coins that total $0.85. Some of the coins are dimes, and others are nickels. How many of each coin is thers? given that (3x-a)(x-2)(x-7)=3x^3-32x^2+81x-70, determine value of a