Graph each function. identify the domain and range. part 2

Bismuth-210 is an isotope that radioactively decays by about 13% each day, meaning 13% of the remaining bismuth-210 transforms into another atom (polonium-210 in this case) each day. if you begin with 233 mg of bismuth-210, how much remains after 8 days?

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Write numerical coefficient of y² in the expression 2x² - 15xy – 7y²