exam Maths Puzzle Numerical Ability

can i use your great knowledge and pick you rbrain on how this is to be solved. thank you in advance. what is a function??

Determine whether each relation is a function

6.

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exam Other Question

Hi. Can I have some help with the following equation

Find all real solutions of the following equation. (If there are extra answer boxes, enter NONE in the last boxes.)

sqrt(x)-2 root4(x) - 15 = 0 Draw the graph of this equation:
y=1/3x-3