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  1. Introduction to algebra | Algebra (all content) | Math | Khan Academy

    Unit test Test your understanding of Introduction to algebra with these 13 questions.

  2. What is a function? (video) | Functions | Khan Academy

    I'll try explain this as best as i can. Describing something as a function is sort of labelling it. Equations show the equality of two expressions. Functions are more specific than equations; they show a …

  3. Khan Academy | Free Online Courses, Lessons & Practice

    Created by experts, Khan Academy’s library of trusted, standards-aligned practice and lessons covers math K-12 through early college, grammar, science, history, AP®, SAT®, and more.

  4. Intro to rational & irrational numbers | Algebra (video) | Khan Academy

    You would probably not need to apply those numbers in Algebra 1 however they are quite useful. For example, "e" is the basis of calculus and appears in a lot of limits and functions.

  5. Intro to Logarithms (article) | Logarithms | Khan Academy

    While it is true that (-2)³ = -8, logarithms with negative bases aren't defined. An expression is not defined is when it doesn't work in math. For example, 1/0 is not defined, because nothing can be multiplied …

  6. Integers: addition and subtraction | 7th grade math | Khan Academy

    Let's extend our addition and subtraction understanding to include negative numbers. Whether we need temperatures below zero, altitudes below sea level, or decreases from any other reference point, …

  7. Limits intro (article) | Khan Academy

    Limits intro VA.Math: MA.CF.2.a, MA.CF.2.b, MA.CF.2.c, MA.CF.2.e.i, MA.CF.2.e.ii, MA.CF.2.e.iv

  8. Quadratic formula explained (article) | Khan Academy

    The quadratic formula helps you solve quadratic equations, and is probably one of the top five formulas in math. We’re not big fans of you memorizing formulas, but this one is useful (and we think you …

  9. Slope, x-intercept, y-intercept meaning in context - Khan Academy

    Great question! The function would have a sudden change in the rate/slope, and so it becomes non-linear. You could express this as a piecewise function: …

  10. Intro to long division of polynomials (video) | Khan Academy

    Intro to long division of polynomials CCSS.Math: HSA.APR.D, HSA.APR.D.6 Google Classroom Microsoft Teams