A charity organization is holding a benefit event. It receives $28,000 in donations and $225 for each ticket sold for the event. What equation models the total amount earned from the event as a function of the number of tickets sold? The same charity organization mentioned above has to pay $4,700 for the banquet hall as well as $110 per plate for each ticket sold. What equation models the total amount spent as a function of the number of tickets sold? The first part is y= 225 x+ 28000

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?