book Maths Puzzle Numerical Ability

How do I siimplify the following radical expression.
square root of 10 to the 4th power?

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book Other Question

2a+5b 2a-5b
------- Subtract ------------
2 2

2a+5b divided by 2 and 2a-5b d can you help me with these equations also?

1. -6=5x-2x
2. x-5x=-24
3. 4x-5x=5
4. 5x-5x=2x
5. 8-5x=-18
6. 8x-9x=-1
7. 7x=-14+5x
8. -12x+5x=56
9. -6+7x-6x=3
10. 4x-2=3x+6