COLUMBUS, Ohio (AP) — The vaccinations that U.S. schoolchildren are required to get to hold terrible diseases like polio, measles, tetanus and whooping cough in check are way behind schedule this year ...
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If there are nine people in a room and every person shakes hands exactly once with each of the other people, how many handshakes will there be? How can you prove your answer is correct using a model ...
COLUMBUS, Ohio (AP) — The vaccinations that U.S. schoolchildren are required to get to hold terrible diseases like polio, measles, tetanus and whooping cough in check are way behind schedule this year ...
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