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Anestetic [448]
3 years ago
13

A data analyst is working with a data frame named customers. It has separate columns for area code (area_code) and phone number

(phone_num). The analyst wants to combine the two columns into a single column called phone_number, with the area code and phone number separated by a hyphen. What code chunk lets the analyst create the phone_number column?.
SAT
1 answer:
VARVARA [1.3K]3 years ago
8 0

The code chunk that lets the analyst create the phone_number column is: unite(customers, "phone_number", area_code, phone_num, sep="-"

<h3>What is a data frame?</h3>

A data frame refers to a two-dimensional array-like structure or table that is made up of rows and columns, which is typically used for storing data in R Studio using the R programming language.

In Computer programming, a data frame is a list of vectors that are all equal in length, and each column consist of values of one variable while each row consist of a set of values from each column.

<h3>The executable code in R Studio.</h3>

In this scenario, the code chunk that would be used to create a data frame that combines the two columns into a single column (phone_number) is:

  • unite(customers, "phone_number", area_code, phone_num, sep="-"

Read more on data frame here: brainly.com/question/25558534

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Profit margins are rarely static over time
astra-53 [7]

The statement that is incorrect regarding trading comparables is profit margins are rarely static over time.

<h3>What is trading comparable?</h3>

Trading comparables is known to be a form of a market based valuation method or process that is said to be like transaction comparables.

Note that The statement that is incorrect regarding trading comparables is profit margins are rarely static over time and it is not true because they can be static a lot.

See full question below

Which of these statements is incorrect regarding trading comparables?

Select one:

High growth companies typically have higher multiples

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7 0
2 years ago
If the molecules in the above illustration react to form nh3 according to the equation n2 + 3 h2 2 nh3 ,.
Dennis_Churaev [7]

A. The limiting reagent in the reaction is N₂

B. The number of mole of NH₃ molecules produced is 4 moles

C. The number of H₂ molecules in excess is 1 mole

<h3>A. How to determine the limiting reactant </h3>

From the diagram,

  • Mole of N₂ = 2 moles
  • Mole of H₂ = 7 moles

N₂ + 3H₂ —> 2NH₃

From the balanced equation above,

1 mole of N₂ requires 3 moles of H₂.

Therefore,

2 moles of N₂ will require = 2 × 3 = 6 moles of H₂

From the above illustration, we can see that only 6 moles out of 7 moles of H₂ given is required to react completely with 2 moles of N₂.

Therefore, N₂ is the limiting reactant

<h3>B. How to determine the mole of NH₃ produced </h3>

In this case, the limiting reactant will be used. This is illustrated below:

N₂ + 3H₂ —> 2NH₃

From the balanced equation above,

1 mole of N₂ reacted to produce 2 moles of NH₃.

Therefore,

2 moles of N₂ will react to produce = 2 × 2 = 4 moles of NH₃.

Thus, 4 moles of NH₃ molecules were obtained from the reaction.

C. How do determine the excess reactant

From A above, we discovered that N₂ is the limiting reactant.

Therefore, H₂ will be the excess reactant.

<h3>Further proof</h3>
  • Mole of H₂ given = 7 moles
  • Mole of H₂ that reacted = 6 moles
  • Excess of H₂ =?

Excess of H₂ =  7 – 6

Excess of H₂ = 1 mole

<h3>Complete question:</h3>

See attached photo

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4 0
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D. papal bulls granting authority over found land
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Answer:

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If <br> (x — 2)2 + (y — 3)2 (z + 4) = 0 what is the value of x + y + z? A) —4 B) 0 C) 1 D) 2
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Answer:

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Explanation:

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8 0
3 years ago
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