exam Maths Puzzle Numerical Ability

Combine terms; indicate the LCD. Can you please help me with this.25/5-m - 5m/m^2-25

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exam Other Question

how do you simplify, and write an answer as a power of 10? ex. 10power of -2 divided by 10 -4power match the terms with the definitions

terms
1. (5x + 2y)2
2. (x - 2y)2
3. (x - 2y) (x + 2y)
4. (5x - 2y)2
5. (5x + 2y) (5x - 2y)

definitions
a. x2 - 4xy + 4y
b.