We are planning a Field Trip!! Group A rented and filled 3 vans and 6 buses with 204 students. Group B rented and filled 1 van and 3 buses with 97 students. Every van had the same number of students in it as did the buses. Select which TWO equations can be used to represent this situation. A. v + b = 107
B. 3v + 6b = 204
C. 3v + 3b = 97
D. v + 3b = 97
E. v + 6b = 204
F. 2v + 9b = 107

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?