book Maths Puzzle Numerical Ability

4+y=12

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Linear Inequalities
The school board is investigating ways to hire a faculty for the summer school program. They can hire teachers and aids. A minimum of 20 faculty members is ne
I am not sure how to do this problem because I have no number for a.
8-3x^2=-13
I plugged in my a,b,c for the quadratic formula,but my a was 0. I am not sure how to do this now!