单项选择题

Questions 14-16 refer to the following graphs.

If x + 2y = a and x - 2y = b, which of the following expressions is equal to xy

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单项选择题

单项选择题

In 1990, twice as many boys as girls at Adams High School earned varsity letters. From 1990 to 2000 the number of girls earning varsity letters increased by 25% while the number of boys earning varsity letters decreased by 25%. What was the ratio in 2000 of the number of girls to the number of boys who earned varsity letters

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