PLEASE HELP, I NEED TO GET THIS DONE QUICK. djtwinx017, come on... you know we are bros, you don't gotta do this to a brotha...

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?

Arectangular yard has area 96 square feet. if the width of the yard is 4 feet less than the length

Look at the figure xyz in the coordinate plane. find the perimeter of the figure rounded to the nearest tenth.