exam Maths Puzzle Numerical Ability

multiply and simplify (5+4i)(3-7i)
15-35i+12i+28
43-23i

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exam Other Question

A square is 5 meters longer than a side of an equilateral traiangle. The perimeter of the square is 2 times the perimeter of the equilateral triangle. Find the length of each side Solve the following system of linear inequalities by graphing.

x - y ≤ 3
x + 2y ≥ 6