exam Maths Puzzle Numerical Ability

9-(-2)(-7)=

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exam Other Question

Perform the indicated operations:
2√[48] + 7√[12] –√[27]

I have no clue how to even start this one..
Are the ordered pairs a solution of 4x+6y LESS than or = to 48

ordered pairs::: (5,5), (10,-2), (-2,10), (6,4)