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Subtracting: regrouping twice | Addition and subtraction | Arithmetic | Khan Academy
By Khan Academy
Getting a little fancier with our regrouping now. What if you have TWO numbers that require you to borrow or regroup? You guessed it! You have to take value from one place and give it to another.
Ratio tables
By Khan Academy
We're displaying ratios in a table format here, and then asking: given a ratio, solve for equivalent ratios. Here are a few examples to practice on.
By Khan Academy
Some distributions are symmetrical, with data evenly distributed about the mean. Other distributions are skewed, with data tending to the left or right of the mean. We sometimes say that skewed distributions have tails.,1211
Solve systems of linear equations with substitution
By Khan Academy
Sal solves the following system of linear equations using substitution: -3x-4y=-2 and y=2x-5.
Simplify rational expressions by canceling monomial factors
By Khan Academy
Sal explains what it means to simplify a rational expression and why we would want to do that. Just don't forget the excluded values!
Simplify rational expressions by canceling binomial factors
By Khan Academy
Sal������������simplifies and states the domain of (x^2-36)/(6-x).
Simplify rational expressions by canceling monomial factors
By Khan Academy
Sal explains what it means to simplify a rational expression and why we would want to do that. Just don't forget the excluded values!
Solving quadratics by taking the square root
By Khan Academy
Sal shows a few examples of quadratic equations whose form allows for solving by simply taking the square root of both sides (after quickly arranging the equation).
Solve any system of two linear equations
By Khan Academy
Sal solves the following system of equations by eliminating x: x-4y=-18 and -x+3y=11.
Solve any system of two linear equations
By Khan Academy
Sal solves a system of two linear equations in standard form, and then approximates the solution of a system whose solution isn't clearly visible.