exam Maths Puzzle Numerical Ability

Hi could you help me simplify this expression?

sqrt8x^3 times sqrt2x^5

Thanks for the help

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exam Other Question

use elimination to solve the system x-4y=1 and x+2y=19 for x a plumber charged $110 for three-hour job and $160 for a five-hour job. At this rate, how much would he charge for an eight-hour job?