This question is from apex: algerba 1 sem 2: 3.5.3 quiz ( ! ) whats is the result of substituting for y in the bottom equation? y=x-3 y=x2+2x-4 (answers: ) a. x-3=x2+2x-4 b. y=(x-3)2+2(x-3)-4 c. y=x2+2x-4-(x-3) d. (x-3)=x2

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?