The estimate that best describes the area under the curve in square units is 30 units² since 30 squares were counted: Option D is correct.
To get the area of the given curve, we only need to count the approximate number of square boxes that were shaded.
Since the shape of the shaded part is an irregular figure, it will be difficult to compute the area using a formula.
Hence by visually counting the number of units boxes in the shaded portion, we can see that the estimate that best describes the area under the curve in square units is 30 units² since 30 squares were counted.
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