bri2576
04.12.2019 •
Mathematics
Alocal consumer reporter wants to compare the average costs of grocery items purchased at three different supermarkets, a, b, and c. prices (in dollars) were recorded for a sample of 60 randomly selected grocery items at each of the three supermarkets. in order to reduce item-to-item variation, the prices were recorded for each item on the same day at each supermarket.
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Ответ:
(9,81)
Step-by-step explanation:
9x=2x+63
7x=63
x=9
y=9x9
y=81