Three families went to an amusement park together. The number of people in each
family is listed in the table.
Family Adults Children Seniors
McGraw 2 3 1
Churchill 1 2 2
Sanchez 2 1 1
Write an expression in simplest form to
show how much it costs all adults, children,
and seniors from the three families to
attend the amusement park when
a is the

cost of an adult ticket,

c is the cost of a

child ticket, and

s is the cost of a senior

ticket.