book Maths Puzzle Numerical Ability

containing the points (3,-4) & (2,1)

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book Other Question

One of the pitchers of the Chicago Cubs has a fastball that is electronically timed at 97.49 mph. Home plate is 17 inches long. How much time (in seconds) does the center of the ball take to pass directly over the plate? I need to know how to find 68% of 50 Is there any way you can give me the formula or a way to find the % of whole numbers like that?