left hand sums   3 videos

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  Sum of Digits

  Algebra Word Problems Using Systems of Equations

  How to solve a problem when asked to switch the digits of a 2-digit number.

  sum digits word problem
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  Graphing Quadratic Equations

  Algebra Quadratic Equations and Functions

  How to graph a quadratic equation by hand.

  x intercepts y intercepts vertex axis of symmetry discriminant substitute
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  Additive and Multiplicative Inverses

  Algebra Pre-Algebra

  How to find additive and multiplicative inverses.

  additive inverse multiplicative inverse product sum