exam Maths Puzzle Numerical Ability

let z1=8(cos5pi/4 + isin5pi/4) and z2=2(cos5pi/12 + isin5pi/12)
Find each of the following in the form a+bi

a. z1/z2
b. (z2)^6

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exam Other Question

i am having problems solving these 3 problems #65 1/2(x+3)+1/3(3x+6) and #67 12x/5(5/12)+(-6x)(-1/6) and #69 -8/8(7xsquare/8)+1/3(3xsquare)+(3xsquare/4)(4/3) please help me. thanks!!! Anna has 6 liters of 60% acid. How much water should she add to make a solution that is 40% acid?