The grocery store sells bottles of juice in six-packs, or they can be bought
separately. edward is preparing a barbecue this weekend, and plans to have 4 families
attending. if there are 2 people in each family who will drink juice, and each of them will
drink 2 bottles, how many six-packs of juice should he buy, and how many extra single
bottles should he buy?

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?