Plz plz help me plzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzz
Each swing that Susan builds requires $10 in hardware and $20 in wood. She uses the expression 10 + 20 to represent the total cost of building one swing.
Which expression represents the total cost of building three swings?
A.
10 + (3 • 20)
B.
3 + (10 + 20)
C.
3 • (10 + 20)
D.
3 • 10 + 20