# How do you evaluate 40 − 2b, for b=4?

32

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To evaluate ( 40 - 2b ) for ( b = 4 ), substitute ( b = 4 ) into the expression: [ 40 - 2(4) = 40 - 8 = 32 ]

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When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.

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