Answer:
18.6
Step-by-step explanation:
Answer:19
Step-by-step explanation:
7x3=21
21-2=19
Its adding the current number by the previous number so the next three would be 21,34,55
We can simplfiy to be 
.
We know that 
is 10 and 
is i, so the answer is 10i, or D.
One way to solve it is writing two equations based on the info so
y = 5x + 10 for members
y = 6x for nonmembers
(the + 10 isn't included in the second equation because nonmembers won't pay a membership fee)
and to find their intersection point (where the values will be the same), you just set them equal to each other:
5x + 10 = 6x
subtract 5x
x = 10 classes
