Its a good thing this family has "just-in-case" funds because one month their car had two flat tires, and they spent $397.00 to buy new tires! what percent of their monthly income was that expense? (round to the nearest whole percent) monthly income: $3500.00 housing costs: 30% ($1050.00) food: 20% ($700.00) clothing: 10%

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?