book Maths Puzzle Numerical Ability

What is the axis of symmetry of x^2+9x+4?

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book Other Question

Your cost in manufacturing a set of specialized toy blocks consists of a setup expense of $20 plus $0.20 per block. Let C be the total cost of producing a set of blocks, and let x A board game for 2 to 6 players has a deck of cards that can always be divided evenly among all the players. What is the smallest numbers of cards that are possible?