exam Maths Puzzle Numerical Ability

If the average (arithmetic mean), of 6, 6, 12, 16, and x is equal to x, what is the value of x?

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exam Other Question

Please help me solve this equation. I have to graph the exponential function
y=-(3/2)x. x is the eponent that I have to plug into the function. My table has the integers -2,-1,0,1,2
How would you do this problem, it has to be graphed

y= -1/3x + 3 ?