11. The cost for a group of people to go to the movies is given by the expression 9a +5b, where a is the number of adults and b is the number of children. What are the variables of this expression? A. 9 and 5 B. a and b C. 9a and 5b D. + and x​

c is the correct answer

step-by-step explanation:

answerthe vertex form

step-by-step explanation:

point a is the center of the circle that passes through points e, f, and g and the center of the circle that passes through points x, y, and z.

- (2, -7)

- lines r and s and lines t and u must be parallel