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

Aspacecraft can attain a stable orbit 300 kilometers above earth if it reaches a velocity of 7.7 kilometers per second. the formula for a rocket's maximum velocity v in kilometers per second is vequalsminus0.0098tplusc ln upper r, where t is the firing time in seconds, c is the velocity of the exhaust in kilometers per second, and r is the ratio of the mass of the rocket filled with fuel to the mass of the rocket without fuel. find the velocity of a spacecraft whose booster rocket has a mass ratio of 20, an exhaust velocity of 2.1 km/s, and a firing time of 15 s. can the spacecraft achieve a stable orbit 300 km above earth?