book Maths Puzzle Numerical Ability

Name the properties used in each step.
1. =3C+5C+5(2)

2. =(3C+5C)+5(2)

3. =(3+5)C+5(2)

4. =8C+10

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book Other Question

please help me find all the roots of the equation: x^7-2=0 How do I do the following problem?

log 81=4
b^

Thank you for your help