Which statement correctly describes the relation between the variables in the equation c=\pi d
a. c varies directly as d
b. c varies inversely as d
c. c varies jointly as d
d. c varies directly as c=\pi

Find an bif a = {3, 6, 9, 12) and b = {2, 4, 6, 8, 10).

Student representatives surveyed their classmates on their preference of a school mascot for a new school. the results are shown in the table below. which pair of samples seems most representative of student preference?

What ratio is proportional to 18/21