book Maths Puzzle Numerical Ability

Please help me solve this problem. -7i+6i
__________
9-4i

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book Other Question

When you use text-based communication, how do I interpert the expression sqrt xy + 9? What is xy + 9 if x=7 and y = 4 The volume of a box is 3p^4 + 16p^3 + 21p^2. The height is p, and the width is p + 3. What is the length?