exam Maths Puzzle Numerical Ability

I need some help with this problem

Simplify assume x represents a positive number

Sqaure root of 80x^4

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exam Other Question

PLEASE HELP ME!!!!!!1

Solve the sytem of inequalities by graphing. IF the system does not have a solution, write no solution.

x > 2 and y < or equal to x+3 Please help me .I need to fine the equation ,in standard form, with all integer coefficients, of the line perpendicular to x+2y=8 and passing through (1,-6)

Thanks very much for all your help .