9. For a play at the local high school, the adult
tickets are $15 and student tickets are $12.
A group of 11 adults and students bought
tickets and paid a total of $156. How many
of each type of ticket was purchased?

slope= 1

y-inter slope= 0

x       y

o     0

1       1

2     2

ect.

step-by-step explanation:

for this case we have that by definition, the surface area of a cylinder is given by:

where:

r: it is the radius of the cylinder

h: it is the height of the cylinder

we can also rewrite it as:

where:

la: it's the lateral area

ba: area of the base

option a