exam Maths Puzzle Numerical Ability

My question is if the vertex of f(x)=-x^2+bx+8 has y-coordinate 17 and is in the second quadrant, find b.

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exam Other Question

Your teacher is giving you a test worth 100 points containing 40 questions. There are two-point and four-point questions on the test. How many of each type of questions are on the test? solve each systems of equations algebraically


38. -3x+12y=6
2x-8y=6