exam Maths Puzzle Numerical Ability

Partners in a business agreed to take out 2 loans totaling $35000. The yearly interest rates were 12% and 15% and the total yearly interest was $4650. Find the amount of each loan.

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I need to solve this problem and show my work. Can anyone help?

Write each expression in the form of a + bi, where a and b are real numbers.

-3i(4i - 1)
Are lines L1 through points (-3,2) and (0,4) and L2 through points (2,3) and (5,1) perpendicular?