exam Maths Puzzle Numerical Ability

jan invested $1200 at a certain simple interest rate and $2200 at a rate 3% higher. her annual earnings were $253. find the two interest ratesif earned $121 more on the larger inve

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exam Other Question

Solve each system by graphing

2x=3y
y=2x+4

Thanks find all roots of the polynomial x3 - x2 +16x -16

possible answers:
1, 4, -4
-1, 4, -4
-1, 4i, -4i
1, 4i, -4i

what does the i come from? please explain equation and solution.Thank you