exam Maths Puzzle Numerical Ability

please help me with this equation:

what is the square roots of 800, 216, 7 radical 27?

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exam Other Question

If y - x = -3 and 4x + y = 2, then what does x equal? I tried this over and over and can not get this:

Solve the following system by graphing:

3x - 6y = 9 :EQUATION 1
X - 2Y = 3 : EQUATION 2

Y-INTERCEPT AS AN ORDERED PAIR =>