exam Maths Puzzle Numerical Ability

HI! May I get some help with this expression?

Evaluate the expression and write the result in the form a + bi.

(6 + 5i)^-1

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exam Other Question
The Length of a rectangle is twice the width; the perimeter is 42 inches. Find the width Can someone out there help me solve this problem?

I need to find the mode on this set of numbers:

41, 43, 56, 67, 69, 72

Thank you,
sher