exam Maths Puzzle Numerical Ability

Write the following equations in the form a+bi

a. i^42 - i^18

b. 1/3-i

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exam Other Question

if the length of a rectangle is 9/y-4 m,while its width is 4/y m,which solution is true?
a.perimeter:26y-32/y(y-4) m
b.area:26y-32/y(y-4) m^2
c.perimeter:13y-16/y(y-4) m
d.area Venture capital Henry invested $12,000 in a new restaurant. When the restaurant was sold two years later, he received $27,000. Find his average annual return by solving the equation 12,000(1 + r)�=27,000