Answer: B (130)
Explanation:
A trapezoidal Riemann sum can be found by multiplying the width (the change in x) of each sub interval by the average of the y values of the two points at either end of the section and then adding up all of the sun intervals. Therefore, the trapezoidal approximation would equal 0.5(40) + 1.5(50) + 1(35) to get the answer of 130.
Agriculture and pastoralism<span> began to transform human societies. </span>Pastoralism<span> and</span>agriculture led<span> to more reliable and </span>abundant food supplies<span> which increased population. Surpluses of </span>food<span> and other goods </span>led<span> to specialization of labor, including new classes of artisans and warriors, and the development of elites</span>
