exam Maths Puzzle Numerical Ability

A book contains 500 pages. If there are 200 typing errors randomly distributed throughout the book, use the Poisson distribution to determine the probability that a page contains e

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Find the distance between points A(4,-3) and B(-4,3).

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Hi. I need help answering the following question. Thanks in advance.
Sandy has $3.75 in change. She has three more quarters than dimes but twice as many nickels as quarters. Express as an algebraic equation and simplify.