exam Maths Puzzle Numerical Ability

Helen Weller invested $15,000 in an account that pays 11% simple interest. How much additional money must be invested in an account that pays 14% simple interest so that the average return on the two investments amounts to 12%?

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(1,-5)M=-25 graph each line passing through the given point and having the slope I need some help checking this question. Thanks.

Simplify: y(to the power of 60) + y(to the power of 45) / y(to the power of 15)

Answer: y(to the power of 30)(y(to the power