book Maths Puzzle Numerical Ability

Consider the relationship E X E, where E ={-2,3,4,5,9} List the ordered pairs
determined by {(x,y):> 4 and y < 4}
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book Other Question

What is the proof for this logarithmic identity using A) exponential functions and b) logarithmic properties
(loga x)(logb a) = logb x
SHOW THAT EACH NUMBER CAN BE WRITTEN AS THE RATIO OF TWO INTEGERS.

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