Chapter 2.5

• Mathematics
• Secondary Education

Expression

6c - 25

2b + 14

Equation

5 = 6c - 25

7b + 4 = 2b + 14

Formula

The total cost (c)  of  two-dollar apple each.

c = 2n 

where n is the number of apples.

What is the perimeter of the rectangle in expression?

2n + 1

4n - 5

What is the perimeter of the rectangle when n = 2?