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4 years ago

Use De Morgan’s laws to write negations to the following statements:

Mathematics

2 answers:

saveliy_v [14]4 years ago

8 0

Answer: The negations are:

1. The train is not late and my watch is not fast.

2. Dogs don't bark or cats don't meow.

Step-by-step explanation:

Hi!

De Morgan's laws for two propositions P and Q are:

1. ¬(P ∨ Q) = (¬P) ∧ (¬Q)

2. ¬(P ∧ Q) = (¬P) ∨ (¬Q)

where the symbols are,

¬ = not

∨ = or

∧ = and

1. In this case the proposition is P ∨ Q, with

P = "the train is late"

Q = "my watch is fast"

Then by law 1: ¬(P ∨ Q) = "The train is not late and my watch is not fast"

2. In this case the proposition is P ∧ Q, with

P = "dogs bark"

Q = "cats meow"

Then by law 2: ¬(P ∧ Q) = "Dogs don't bark or cats don't meow"

Paraphin [41]4 years ago

5 0

Answer:

Step-by-step explanation:

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Answer:

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Step-by-step explanation:

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Step-by-step explanation:

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4 years ago

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borishaifa [10]

Answer:

Option C - Multiply the 1st equation by 2

Step-by-step explanation:

To find : Which step could be completed in order to prepare the system of equations below for the elimination method?

Solution :

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2nd equation: $8x+6y=15$

For elimination method,

We eliminate the y by multiplying 1st equation by 2 and add by 2nd equation.

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Add with 2nd equation,

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4 years ago

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Answer:

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Step-by-step explanation:

Let's solve by opening the bracket first

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Open the bracket

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Divide both sides by 28

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Answer:

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Step-by-step explanation:

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