exam Maths Puzzle Numerical Ability

Graph and state whether increasing or decreasing:
y=2^x
y=(1/2)^x
y=log2(x)
y=log1/2(x)

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exam Other Question

The average of four numbers is 98. If three of the numbers are 86, 87, and 91, what is the fourth number? a 16 yard fishing line is cut ino two pieces. express the longer piece in terms of the shorter