exam Maths Puzzle Numerical Ability

Please help me figure out how to do this problem. Thanks

sqrt(x+13) =5

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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 (1) How do we write the equation of a horizontal line? What would be an example?

(2) How do we write the equation of a vertical line? What would be an example?

(3) The points