When merging onto an expressway from an acceleration lane, you should a: speed up as quickly as possible to get ahead of the expressway traffic beside you. b: yield the right-of-way to all traffic already on the expressway. c: enter the right lane of the expressway at any point, because you have the right-of-way.

B: Yield the right-of-way to all traffic already on the expressway.

Explanation:

Driving is an act that requires extreme responsibility. When you drive you must be a responsible driver who abides by all laws, signs and traffic signs. In addition, a responsible driver should keep his or her attention on the road, avoiding maneuvers that could cause possible accidents and paying attention to the structure and operation of your car. If you are a prudent and responsible driver when merging into an expressway from an acceleration lane, you should use the lane for all traffic already on the expressway.

answer: the exterior temperature of commercial jet planes as they leave the stratosphere and return to the ground increases steadily.

explanation:

the lower most layer of atmosphere is troposphere which extends from 0 to 12 km above the surface of the earth. the temperature initially decreases as distance is increased from the earth's surface. commercial jets fly in lower part of the stratosphere. the stratosphere extends upto 50 km. the temperature in stratosphere starts rising again due to presence of ozone which traps the uv rays.

thus, when the planes leave the stratosphere and return to the ground, the exterior temperature increases steadily.