Simplify this expression: 3(x + 4.5) + 2(2.6x – 3)

1. Distribute the 3 and 2 through the parentheses: 3(x) + 3(4.5) + 2(2.6x) - 2(3)

2. Find each product: 3x + 13.5 + 5.2x - 6

3. Combine like terms:

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?