exam Maths Puzzle Numerical Ability

Do you know the rule for determining if a triangle is possible when you have 3 side lengths? I just cant remember this! Thanks

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exam Other Question

the follow cryptogram was encoded with a 2 X 2 matrix 5,2,25,11,-2,-7,-15,32,14,-8,-13,38,19,-19,-19,37,16

the last word of the message is -Sue what is the message?

I am not sure what 2 by 2 matrix to use?
General Vehicles operates a plant that assembles and finishes both cars and trucks. It takes 5 mand-days to assemble a truck, and 2 and-days to assemble a car; thefinishing process