Acertain element has a half-life of 69 years. an experiment starts with 1,500 grams of the element. the amount of the element remaining x years after the experiment began can be modeled with the function f(x) = 1,500(2)–x/69. the mathematical domain of the function is all real numbers. which statement describes how the reasonable domain compares to the mathematical domain? the reasonable domain is restricted to integers. the reasonable domain is restricted to positive real numbers. the reasonable domain has a minimum value of 1,500. the reasonable domain has a maximum value of 1,500

The answer is:

The reasonable domain is restricted to positive real numbers.

From the statement we know that the experiment starts with 1,500 grams, and the given function is un function of the time (years), so, since the time cannot be negative, the reasonable domain is restricted to positive real numbers.

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step-by-step explanation:

points a and b are equidistant from the desired line, so the line you find by using them will go through point r.

using points other than a and b will give the desired line only if they are equidistant from r. if they are randomly located, the perpendicular line you create will not necessarily go through point r, hence will not be a solution to the problem.