Which expression can be used to convert 80 US dollars (USD) to Australian dollars (AUD)? 1 USD = 1.0343 AUD 1 AUD = 0.9668 USD 80 U S D times StartFraction 0.9668 U S D Over 1 A U D EndFraction 80 U S D times StartFraction 1.0343 U S D Over 1 A U D EndFraction 80 U S D times StartFraction 0.9668 A U D Over 1 U S D EndFraction 80 U S D times StartFraction 1.0343 A U D Over 1 U S D EndFraction Alexis bought x boxes of cereal for $3 each, including tax, and paid with a $20 bill. Which expression represents the total amount of change she should receive? 20 – 3x (3 – 20)x 3x – 20 (20 – 3)x