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

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exam Other Question

how do I graph 2y+5x=-2

I came up with (0,-1) and (-2/5,0) but do not know if it is correct and if so how to graph Determine the maximum possible number of turning points for the graph of the function:
f(x)= x to the fifth power + 2x to the sixth power