Find the sum of a finite geometric series. jimmy’s dad gave him $100 on his birthday, which is january 1. jimmy deposited the $100 in his savings account the same day. at the beginning of every month thereafter, jimmy decides to deposit three times the amount he did in the previous month. on june 15 of the same year, the amount in jimmy’s account will be $. nextreset

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?