Answer:
arc length = radius * central angle in degrees * (PI / 180)
arc length = 7 * 90 * (3.14159265 / 180)
arc length = 10.995574275
http://www.1728.org/radians.htm
Step-by-step explanation:
A. because when you divide all of the groups, 17.699/11, 41.834/26, 54.706/34, they all get the same answer, 1.609, so they are all proportional, because the relationships stays the same
Hope this helps!
R=i/pt
i=16731.12-16100=631.12
R=631.12/16,100×1
R=0.0392*100=3.92%