Suppose you play third base for you high school softball team, in the last four games you had a a total of 6 hits in 15-at-bats. Assuming you will have 4-at-bats at tomorrow's game. How many hits will you need to have a batting average greater than .450? Write and solve an inequality to find the number of hits you need. I'm stumped on writing an inequality, and I have to write 4 more after this, so an explanation would be helpful and appreciated. Right now all I have is, >=.450

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?