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amm1812
2 years ago
7

Select all the expressions that are equivalent to –25(15 – 20d + 5c)

Mathematics
1 answer:
In-s [12.5K]2 years ago
5 0

Answer:

-375+500d-125c

-125c+500d-375

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1 year ago
Find a compound proposition involving the propositional variables p, q, and r that is true when exactly two of p, q, and r are t
VLD [36.1K]

Answer:

Consider the proposition C=(p∧q∧¬r)∨(p∧¬q∧r)∨(¬p∧q∧r)

Step-by-step explanation:

This compound proposition C uses the outer disjunction (∨) then the proposition is true if and only if one of the three propositions (p∧q∧¬r),(p∧¬q∧r),(¬p∧q∧r) is true.

First, it is impossible that two or three of these propositions are simultaneously true. For example, if (p∧q∧¬r) and (p∧¬q∧r) are both true, then ¬r is true (from the first conjuntion) and r is true (from the second one), a contradiction. All the other possibilities can be discarded reasoning in the same way.

Since these propositions are mutually excluyent, C is true if and only if exactly one of the three propositions is true (and false otherwise). This can only happen if exactly two of p,q, and r are true and the other one is false. For example, (p∧q∧¬r) is true when p and q are true, and r is false.

8 0
3 years ago
A bird was sitting 9 meters from the base of an oak tree and flew 10 meters to reach the top of the tree. How tall is the tree?
ArbitrLikvidat [17]
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36=x^2
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:)
4 0
3 years ago
How to compare ratios?
iren2701 [21]
You can compare ratios by using a colen, the word "to", and a fraction. Examples

3:4
3 to 4
3/4
3 0
3 years ago
Read 2 more answers
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