In america, a person uses about 100 gallons of water each day, which is equal to 1,600 water-filled drinking glasses. how many water-filled drinking glasses would 281 americans fill in a weeks time?
a. 449,600 water-filled glasses
b. 28,100 water-filled glasses
c. 3,147,200 water-filled glasses
d. 196,700 water-filled glasses

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?