exam Maths Puzzle Numerical Ability

Write each of the following expressions in the form a +bi

a. (6+i)(3-2i)
b. i^19-i^2
c. 1/2+i

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exam Other Question

Help, please! Solve for y:
x^2-xy+y^2=6
Thanks!! Two Gasoline Distributors, A & B, are 228 mi apart on Interstate 80. A charges $0.85/gal and B charges $0.80/gal. Each charges $0.05/gal per mile for delivery. Where on Interstate 80 is the cost to the customer the same?