exam Maths Puzzle Numerical Ability

Two sides of a triangle are 12 and 15 cm long. Which measurement can be the length of the third side?

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exam Other Question

Is this rational or irrational:

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I believe this is irrational because there is no numbers involved in this, am I correct? Thank you very much! I have a Future Value Equation that I need help to do two things. 1) solve for payment and move that to the other side of the equation. 2) solve for # of months and move that varia