exam Maths Puzzle Numerical Ability

Evaluate 3 sqrt -8/27

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exam Other Question

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. I have tried this problem in so many ways. My study guid for the placement exam says Alogebriac expression- compute and simplify.

(x-3)- (x-1)(x-1)

the answer is -6x+10 but I have no idea how they got that.