Which story shows 5 → A. Tim has 5 apple ples. He gives of a ple to a friend. How much ple does he have left?
B. Tim has 5 apple ples. He gives - of a ple to each friend. How many friends get ple?
4
Oc. Tim has 5 apple pies. He buys of a ple more. How much ple does he have now?
D. Tim has 5 apple ples. He eats
of the ples. How many ples did he eat?
이

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?