Ahigh school had 740 students at the start of the year, but then some students left the school. after that, the school had 726 students. if s = the number of students who left the school, which mathematical sentence expresses the information above? a. 740 - s = 726 b. s - 740 > 726 c. s - 740 = 726 d. 740 - s > 726

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?