exam Maths Puzzle Numerical Ability

-20 - (-1)
____________
-3 - (-3)
Help please, I believe this is Undefined but want to double check! Thanks so much for your help.

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exam Other Question

how to solve a problem like this but with numbers 2/3 Explain whether the following statement is a valid definition? "A 150 degree angle is an obtuse angle." Use the converse, biconditional, and at least one Euler diagram to support y