exam Maths Puzzle Numerical Ability

Solve in tems of x?

3^(x/2) + 2^x > 25

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exam Other Question

Use the properties of addition and multiplication to complete the statement.
18 • 4 = 4 • ____
Not sure how this is done at all, help please.
sqrt(2+sqrt(2-sqrt(2+x))) =x



1/(1.2.3.0 +1/(4.5.6)+1/(7.8.9)+.....