What is the physics primer?
a. a set of mathematics topics that are relevant to introductory physics courses.
b. a list of the most important formulas used in introductory physics courses.
c. an detailed explanation of all of the mathematics you will use in your introcuctory physics course.
d. a tutorial of the most important physics concepts covered in introductory physics courses.

A. A set of mathematics topics that are relevant to introductory physics courses.

Explanation:

Physics Primer consists of tutorials, videos, and answers to specific questions, the main idea is to build a solid structure of math concepts for introductory physics. Another great thing about Physics Prime is that it helps students to visualize problems and solve them from different perspectives. The concepts built throughout the course can positively impact the result of the student especially if the course is taken before the physics introductory course.

that tool is called an altimeter which measures your altitude which can be used to tell which atmosphere you are currently in, including the stratosphere.

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