exam Maths Puzzle Numerical Ability

Simplify. Assume x represents a positive number.

sqrt5x^2

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exam Other Question

Determine whether 3sqrt121 is rational or irrational.

I would appreciate a tutor lesson. Thank you. Tell wether the ordered pair is a solution of the linear system.

(-2,15);
y = -3x + 9
y = 5x + 25

Any help with this equation would be Greatly</b> appreciated.