Recall that to find the cost to produce the nth unit in a production process, we calculate the difference C(n)−C(n−1) where C(n) is the cost of producing n units. The total cost (in dollars) for a fast food franchise of producing x thousand hamburgers might be C(x)=18000+700x−80x2. Find the exact cost of producing the 2,001st burger. Be careful though. The units for x are thousand of hamburgers. The 2,001st burger is represented by 2.001!

Statement reason 1. δabc is similar to δced. given 2. 3. definition of slope 4. slope of slope of definition of slope 5. slope of × slope of multiplying the slopes 6. slope of × slope of substitution property of equality 7. slope of × slope of simplifying the right side the table contains the proof of the relationship between the slopes of two perpendicular lines. what is the reason for statement 2? a. parallel line segments that meet a common perpendicular line are proportional in length. b. the lengths of vertical and horizontal sides in congruent triangles are in a common ratio. c. trigonometric identities determine the lengths of the legs in a right triangle. d. corresponding side lengths in similar triangles are proportional in length.