2. Eleanor Raymond works full time while her husband, Peter, attends college and works part time. Their income for the last two weeks consisted of an August 17 paycheck of Eleanor's for
$380.48, $16.50 for a birthday present Peter returned on August 19, Peter's paycheck on
August 21 for $120.00, Peter's sale of some of his college textbooks on August 23 for $13.65,
and a check from Peter's father for $100.00 that arrived August 25. Record and total Eleanor
and Peter's income for this two-week period.

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?