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B. Square hectare

Step-by-step explanation:

A square centimeter is about the size of an adult's thumb fingernail.

A square hectare is about the size of a football field.

A square meter is about the size of two king sized pillows put together into the shape of a square.

A square millimeter is smaller than the eraser on a #2 pencil.

Because you want to use a unit of measurement that is efficient for measuring something very large, you would use a hectare.

4

step-by-step explanation:

it has the same slope and a different y-intercept

hope this : )