Daria sells televisions. She earns a fixed amount for each television and an additional $15 if the buyer gets an extended warranty. If Daria sells 18 televisions with extended warranties, she earns $1,440. How much is the fixed amount Daria earns for each television? The fixed amount Daria earns for each television she sells is $

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?