exam Maths Puzzle Numerical Ability

factor completly 81y^2 - 4 = (9x+2)(9x - 2)

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exam Other Question

These are two word problems:
10.Mona Yahuso earns three times as much each week as three times as much as an actuary as she does as a writer. Her total income is $40,000 more tha Solve using the elimination method:

3x-5y=-4
5x-3y=4