1. -982 + 73 b. Positive
2. 625 +-625
a. Negative
a. Negative
c. Zero
b. Positive
c. Zero
3. 1273 - 1273
a. Negative
b. Positive
Ć Zero
4. [426] + [16]
a. Negative
b. Positive
c. Zero
5.45 X-12x-3
a. Negative
b. Positive
c. Zero
6.65.43 = -19734.65 x 33
a. Negative
b. Positive
c. Zero
a. Negative
b. Positive
7. -43 *-78.41 x - 8.75
c. Zero
c. Zero
8. 1093.5 = 532.15
a. Negative (b. Positive

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?