exam Maths Puzzle Numerical Ability

Write 8/(1+i) as a complex number in standard form

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exam Other Question

Solve by using the quadratic formula. x^2 = 5x + 8
Last one please,
Write the slope intercept form of the equation of the line passing through the point(5,-1) and perpendicular to the line y=3/4x+2. thanks so much in advance