the scatterplot to the left depicts the carbon dioxide (CO2) concentration in parts millions (ppm) above 250 ppm in earth atmosphere between the year 1850 and 2000. which of the following functions best models y the CO2 concentration above 250 ppm, x year after 1850?

Acentral angle measuring 160 degrees intercepts an arc in a circle whose radius is 4. what is the length of the arc the circle formed by this central angle? round the length of the arc to the nearest hundredth of a unit. a) 4.19 units b) 6.28 units c) 12.57 units d) 12.57 square units