Solve the Problem. -The Following Graph Shows the Private, Public and Total National

Multiple Choice

Solve the problem.
-The following graph shows the private, public and total national school enrollment for students for selectyears from 1970 through 2000. i) How is the graph for total school enrollment, T, determined from the graph of the private enrollment, r,the public enrollment, u?ii) During which 10-year period did the total number of students enrolled increase the least?iii) During which 10-year period did the total number of students enrolled increase the most?

A) i) T is the sum of r and u. ii) 1970 - 1980
Iii) 1990-2000
B) i) T is the sum of r and u. ii) 1990-2000
Iii) 1970-1980
C) i) T is the sum of r and u. ii) 1970 - 1980
Iii) 1980-1990
D) i) T is the difference of r and u. ii) 1970 - 1980
Iii) 1990-2000