exam Maths Puzzle Numerical Ability

find the equation that is perpendicular to line AB and line CD and goes through the midpoint

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exam Other Question

This is actually a total value problem using a graph. How many lbs. of whole milk and cream should be mixed to form 200lbs for cream cheese. whole milk= 4% milk fat, milk for cream cheese = 8 % milk fat and cream =30% milk fat. Please help me with this equation!
Write:
4(cos 3pi/4 + i sin 3pi/4) in the form a + bi
Thank you, Ray