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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exam Other Question

I dont even know where to start

Find the value of the polynomial x3 - 4x when x = -2.

A) -2
B) 0
C) 2
D) 14
0.42-0.03y=3.33-y also can you show me how to check please and thanks