exam Maths Puzzle Numerical Ability

Find the interest earned at the end of the first year on 6,800. invested at 4% I started with I=0.4x1/12=6800 then is it0.4 /12=6800/12 I am stuck

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exam Other Question

please help me to find the correct answer for the following:
problem #1: 4-2(k-3m) = 2e
find k

problem #2: 2x^3 y^4 z^3(4x^2 y^4 z^3 - 3xy^3 - 12yz 4. Solve the following linear system for x using Cramer�s rule.
Show work.
4x - y + z = -5
2x + 2y + 3z = 10
5x - 2y + 6z = 1