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
A total of $1150 was investe3d , part of it at 12% and part at 11%. The total yield was $133.75. How much was invested at each rate? How do i graph this linear equation and is it a function

y=x-10