exam Maths Puzzle Numerical Ability

Anna has 6 liters of 60% acid. How much water should she add to make a solution that is 40% acid?

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exam Other Question

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
Can someone please help? I need to see what the following graphs look like
indiviually. I need to have a sketch of them individual.
1. y=(2/3)x-4

2. 8x-3y=24

3. Slope= -3/4&b=6
Thanks, a lot