book Maths Puzzle Numerical Ability

Simplify:
sqrt 15/24y^5
I don't understand these sort of problems.

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book Other Question

I would appreciate it if a tutor could please verify my answer to the following problem.


Use substitution to solve for y: (y+5)^2-4(y+5)-12=0


My answer:


Substituted
Please help me

I am terrible at graphs

Problem:
Graph the relation and state its domain and range.

Thank you