exam Maths Puzzle Numerical Ability

Simplify and evaluate:
(x4y6z12/9-2x3y-8z-9)0

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exam Other Question

Evaluate the following: 3xy-5x for x=3 and y=4
x^2-5x+3 for x=6
6-4x for x=5
Write as a mathematical expression using parentheses and brackets. Then evaluate. "Subtract 3 from 1 the circumference of the great wheel was twelve thousand and forty-one thousandths inches. The circumference of the lesser wheel was only one thousand, twenty-one and two hundred-thousandths inches. How much larger was the great wheel?