Exam Maths Puzzle Algebra

when you have something, say

3(2 + i) is that equal to 3(2 + 0i) or 3( 2 + 1i)?

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Exam Other Question

what is x?
logx^81 = 4
Q1) Solve for N in the following n/3=6/9

Q2) Express 37.5% as a common fraction

Q3) Solve for x : 50 is 20% of x

Q4) 7 2/5% of x is equal to 74. solve for x.