2 over 5 multiplied by x minus 6 equals negative 16

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Estimate the area under the curve f(x) = 16 - x^2 from x = 0 to x = 3 by using three inscribed (under the curve) rectangles. answer to the nearest integer.

Kira looked through online census information to determine the overage number of people living in the homes in her city what is true about kira's data collection?