exam Maths Puzzle Numerical Ability

how to simplify this eqaution?

(-7x3) (20x9)

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exam Other Question

the first example in a lecture of series is a^n=1/2^n can you write the recursion formula for this series?

please help with this, thanks Write an equation of the line containing the given point and parallel to the given line. Express your answer in the form y=mx+b.

(8,9); x+3y=2

I have one more question after