exam Maths Puzzle Numerical Ability

Kackie Smith won $60,000.00 in a slot machine in Las Vegas. She invested part at 2% simple interest and the rest at 3%. She earned a total of $1600.00 in interest. How much was invested at each rate?

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exam Other Question
Factor completely.

y3 - 12y2 + 36y
This is my answer is it right?
y(y + 12)(y - 3) 1) Write the polynomial in descending order. Then determine the degree of the polynomial.

a)6x^3-12+5x b) -7a^2x^3+4x^2-2ax^5+2a