exam Maths Puzzle Numerical Ability

What is the Evalution of Logarithm of 16?

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exam Other Question

Solve the following equation

9y+5 5y+5
----- - -------- = -3
7 2
Could someone please help me solve this word problem I am not understanding how to solve it.

A ball is thrown upward from the roof of a building 100 m tall with an initial velocity of 20 m/s. When will the ball reach a height of 80 m?