exam Maths Puzzle Numerical Ability

how would i do this? Combine the following fractions by addition or subtraction as directed

7 over xz + 2 over xy 4 over yz

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exam Other Question

Simplify 5a^2/3 (2ab^-1)^1/3 A radio shack is going to construct a 5 foot tower for a new anteanna. The tower will be supported by 3 cables, each attached to the top of the tower and to points on the roof of t