book Maths Puzzle Numerical Ability

1/4(8y+4) + 17< -1/2(4y-8)

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please help me solve this:

you are going to invest $20,000, part at 12% and part at 16%. what is the most that can be invested at 12% in order to make at least $3000 interest? 12 = 2x squared + 5x

i tried to do a function box but i couldnt figure it out imissed that day of school but my teacher said to figure it out.