exam Maths Puzzle Numerical Ability

Describe a situation that you can represent using the inequality x is greater or equal to 18. x>18

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can you check this for me please?
3w^2+9w-1 and 8w^2-9w-4
8w^2+9w-4
=5
a x
log x - log a + c . as a single logarithm
a b