exam Maths Puzzle Numerical Ability

I need help with 3y + 2 - 2y - 5 equals 4y + 3

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A ball is thrown downward from a window in a tall building. Its position in time t in seconds is s=16t^2 + 32t, where s is in feet. how long (to the nearest tenth) will it take the ball to fall 175 feet? FIND THE FOCUS OF THE PARABOLA: Y2=20X