book Maths Puzzle Numerical Ability

Identify all rational zeros of the polynomial function f(x)= x^3+4x^2-2x-15

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QUESTION: Conor is scuba diving at a depth of 52.8 feet below sea level. 30 mins later, he is at a depth of 40 feet below sea level. What is his change in depth? Did he go up or down?
PLEASE HELP The midpoint of line segment JK is M. What is the probability that a randomly selected point on line segment JK is closer to M than to J or to K?