exam Maths Puzzle Numerical Ability

Given: 5x+4<14
Prove: x<2

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exam Other Question

Explain why 1 raised to any power is equal to 1. For what numbers x is f(x) = 0?
the graph is: its starts from -1 on the y-axis and cuts over 1 on the x-axis and ends at points (6,1.5)
pls i need this answer urgently
thanks in advance