exam Maths Puzzle Numerical Ability

simplifiy -6x2(-2x2)(x2)
and -3x4(-2x2)

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Word Problem:

If John cleans a house in 8 hours and Julie cleans a similar house in 6 hours, how long should it take them to clean another similar house working together? Solve each exponent equation. Let y= Savings after x years, a=initial investment, b=growth factor. Round all decimals to the nearest hundredth. Solve by graphing if necessary.

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