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You can find the "Punchline Problem Solving, 2nd Edition" by Marcy MathWorks through various online retailers such as Amazon or directly from the Marcy MathWorks website. It may also be available at educational supply stores or through bookstores that specialize in math resources. Additionally, check your local library for a copy or consider digital platforms that offer educational materials.
Algebra exists to find solutions
One can find information on the covariance matrix on the Wikipedia website where there is much information about the mathematics involved. One can also find information on Mathworks.
Algebra
The difference of algebra and algebra 1 is that in algebra they teach you the basics. For example, they teach you about variables, graphs, how to find slopes. In algebra 1 they start using equations and and teach you how to work longer equations and all that jazz.