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Evaluate the following expression 1/3^2

The graph represents the gallons of water in a water tank with respect to the number of hours since it was completely filled

How many of the 250 grandparents in the population would you expect to prefer online shopping with merchant a? merchant a: 4 merchant b: 6 merchant c: 2 merchant d: 3 other: 5 none: 5 answer choices: a.about 4 b.about 8 c.about 40 d.about 21