The city of Raleigh has 9300 registered voters. There are two candidates for city council in an upcoming election: Brown and Feliz. The day before the election, a telephone poll of 300 randomly selected registered voters was conducted. 140 said they'd vote for Brown, 145 said they'd vote for Feliz, and 15 were undecided. Describe the sample for this survey.
All citizens of Raleigh
All registered voters in Raleigh
All registered voters with telephones in Raleigh
The 300 voters surveyed
The 140 voters who said they'd vote for Brown
None of the above

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?