A. B.
C.
DI
50. The table below shows books read by students and frequency. How many students read at most 3
books?
Frequency
Books
read
0
1
2
3
4
5
9
3
6
S
10
2
4 5
D2
D
B
B
A. 5
B. 23
Sor 17
D. 9
vine

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?