exam Maths Puzzle Numerical Ability

Determine whether SQRT (77) is rational or irrational.

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I need help with this problem with explanations so that I will be able to do these problems on my own:
Rewrite each number. If it is positive,write it two ways:
The price of g Please help me solve the following question:
1-8r^3
_divided by______

8r^2+4r+2