The answer is D, the other answers are subtracting and multiplying.
A.occurs while actively observing in the field
<span>1. Both authors use descriptive adjectives.
2. Both authors impart an ominous mood.
5. Both authors use a concerned tone.</span>
<span>No, it is not feasible to use the Earth's rotation to give a rocket a boost into polar orbit. This is due to the fact that a polar orbit is requires a satellite to reach a "high Earth orbit". High Earth orbit requires a lot of energy to reach, meaning using the Earth's rotation to give a boost is not feasible. In contrast, it is common to use the Earth's rotation to give satellite's a boost into low Earth orbit.</span>
