exam Maths Puzzle Numerical Ability

how do you solve this system of equations

x squared + y squared = 9
5x-y=-3

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exam Other Question

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!!!!! Anybody know how to solve this one

Given f(x)=-5x^4+x^3+2x^2+3x+1, and k=1, express f(x) in the form f(x)=(x-k)q(x)+r

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