exam Maths Puzzle Numerical Ability

I don't understand Euler Diagrams. Can someone help me with this problem?

Use an Euler diagram to determine whether the syllogism is valid or invalid
All actre

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exam Other Question
If x2 - 13x + 42 = (x + A)(x + B), then A + B =

-42
-1
13
42
none of these

thank you solve and graph the solution set of each inequality:

-3x+5< or = to 26