exam Maths Puzzle Numerical Ability

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?

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I need help in knowing how to do this problem when solving for x. (x+5)/(x-4)= 3/x+36/(x^2-4x) thank you 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.