A group of 36 went to the theater and spent $153. Adult
tickets cost $7 and student tickets cost $2.50. How many
adults were there in this group?

Step-by-step explanation:

the point of multiplying the equation to 5 and 2 is to simplify it so its easier to apply elimination.

x as a variable for adults

y as variable for students

Step-by-step explanation:f a series is arithmetic the sum of the first n terms, denoted Sn, there are ways to find its sum without actually adding all of the ... Find the sum of the first 20 terms of the arithmetic series if a1=5 and a20=62 . ... 2,5,8,11,14,