exam Maths Puzzle Numerical Ability

Can you help me find two pairs of relatively prime numbers from 5, 10, 16, and 25?

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exam Other Question

Subtract.

4x - 2x to the 2nd power + 4x to the 3rd power FROM 4x to the 3rd power + x - 3x squared i need help with the degree of each polynomial question is a3-3a+4