exam Maths Puzzle Numerical Ability

The average of four numbers is 98. If three of the numbers are 86, 87, and 91, what is the fourth number?

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please help me set up and solve this problem and simplify

2/5x-45 + x/x^2-81
Graph and state whether increasing or decreasing:
y=2^x
y=(1/2)^x
y=log2(x)
y=log1/2(x)