book Maths Puzzle Numerical Ability

Please help me

I am terrible at graphs

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

Thank you

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book Other Question

Simplify:
sqrt 15/24y^5
I don't understand these sort of problems.
Team x can set up chairs in the gym in 15minutes and team y can set up the chairs in 20 minutes. How long would it take them working together to set up the same chairs?
___minutes.
i got 8.5714 but i was wrong.
please help me.
Thank you.