Cavendish Laboratory Psalm 111

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If we have either the or symbol in our inequality we shade in the circle to show that the variable may be equal to that number

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To plot an inequality such as x 3 on a number line first draw a circle over the number e g 3 Then if the sign includes equal to or fill in the circle

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You can know if a bound can be equal to x by looking to see if the circle representing the bound on the graph is filled in or not A filled in circle means it can be equal to x and open circle

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We have an open circle there It s defined everywhere up to that but not including Just as a reminder the open circle means you can get close to it but you don t include that number

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Now if your hand is closed around an item you can contain it within your hand For an inequality example let s use 2 x the circle is closed because 2 is contained and agrees with the

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A closed circle is for when the number is equal or less than the number provided An open circle is for when the number is greater than the number provided

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Closed circuit A circuit is closed if the circle is complete if all currents have a path back to where they came from Open circuit A circuit is open if the circle is not complete if there is a

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A closed dot means that a function includes that number but stops at that number The function y x 1 2 has a closed dot at x 0 since 0 1 2 is equal to 0 but y also can t go below 0

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The open circle says that the function doesn t have a value along the curve at x 1 And the closed filled in circle is saying Hey I m the value of the function at x 1