On vacation, a family of 5 decided to go watch a movie in the morning and a drive-in movie in the evening. The price for a movie in the morning is diffrent than the cost of a drive-in movie in the evening. The tickets for the morning movie cost $6 each. All together the family spent $70. What was the cost for a ticket for the drive-in movie in the evening?

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?