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Anettt [7]
3 years ago
12

Solve the equation below, and check the solution. 0.3x = 9 The solution set is { }

Mathematics
1 answer:
exis [7]3 years ago
7 0

Answer:

  {30}

Step-by-step explanation:

The solution set can be written a couple of ways:

<u>Roster</u>: lists the elements of the set:

  x = {30}

<u>Set builder notation</u>: defines the elements of the set according to some rule or rules

  {x : x = 30}

The latter form can have variations that define the domain of x on the left, such as

  \{x\in\mathbb{Z}:x=30\}

This is pronounced, "x is an element of the set of integers such that x is equal to 30." This sort of notation is more commonly used when the set is specified by an inequality or a functional relationship. You may see the colon (:) replaced by a vertical bar (|).

_____

<em>Comment on the above notations</em>

I don't like the notation x = {30} because the solution to the equation is a value, not a set of values. I prefer to write it as x ∈ {30}. "x is an element of the set containing 30." The "is an element of" symbol (∈) is not always available, so the equal sign is often used instead.

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amid [387]

Answer:

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Step-by-step explanation:

Given :

Mean = $8.52

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We obtain the value of x, with z = 1.645

Using the Zscore relation :

Zscore = (score - mean) / standard deviation

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Cross multiply :

1.645 * 2.38 = score - 8.52

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Score = 8.52 + 3.9151

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8 0
2 years ago
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skelet666 [1.2K]

Answer:

11

Step-by-step explanation:

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8 0
2 years ago
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What is the answer to this question?
Klio2033 [76]
Hey!!!
Answer is.....


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7 0
3 years ago
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Answer:

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