exam Maths Puzzle Numerical Ability

Combine:
3sqrt48-12sqrt75+4sqrt12

also if you could show how you solved I would greatly appreciate it.

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exam Other Question

solve the linear system using elimination

1/4x-2/3y=7
1/2x+2/3y=-4 topic: 30-60-90 triangle in geometry

a triangle with sides 12 and 15 intercepts an angle of 60 degrees. Find the third side.

NOTE: Letters to represent sides dont mater in this problem