exam Maths Puzzle Numerical Ability

simplify and reduce to lowest terms or rationalize

(sqrt)(20m^3b)

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exam Other Question

"Explain in your own words(at least 50 words) why the line x = 4 is a
vertical line?"

I think i know the answer i just have a hard time explaining this can you help me?
FIND THREE CONSECUTIVE ODD INTEGERS.

THREE TIMES THE SECOND MINUS THE THIRD IS ELEVEN MORE THAN THE FIRST?