exam Maths Puzzle Numerical Ability

the ? is determine whether is it posssible to draw a triangle with sides of the given measures.write yes or no and the promble is 15,12,9

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exam Other Question

Solve, and express the answer in set notation:
|9 - 2x| <5
Find all values of y satisfying the following equation:
-6/y+1=-6-1/y-1 Thank you so much!!!