exam Maths Puzzle Numerical Ability

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)

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A die is rolled twice
What is the probabilty of both being a 6 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.