exam Maths Puzzle Numerical Ability

simplify -5 + 7i/7i expressed as a + bi

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exam Other Question

Solve for x given BD = 5x +2 and AE = 6x +7. Assume B is the midpoint of AC and D is the midpoint of CE. The triangle is ACE with a parallel line BD drawn at the midpoint of AC and (ab)^8 + 3(ab)^4 + 2
factor each polynomial. state prime if needed.