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Levart [38]
3 years ago
13

Which of the following is a complex number?

Mathematics
1 answer:
igomit [66]3 years ago
8 0

Answer:

  A.  3√(7/5) +√(-9/5)

Step-by-step explanation:

The square root of a negative number is imaginary. Only answer choice A contains any imaginary numbers, so only answer choice A is complex.

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Find a ⋅ b. a = <5, 2>, b = <4, 5>
cestrela7 [59]

Answer:

  30

Step-by-step explanation:

For a = <xa, ya> and b = <xb, yb>, the dot product is the sum of products ...

  a·b = (xa)(xb) + (ya)(yb)

Substituting the given information, you have ...

  a·b = 5·4 + 2·5 = 20 + 10

  a·b = 30

_____

Some graphing calculators can do such math. There are also dot product calculators available on the Internet. If you have quite a few of these to calculate, you can put the appropriate formula into a spreadsheet.

6 0
3 years ago
Pls answer cggjtzajyrzmkyrkr
tia_tia [17]

Answer: D

Step-by-step explanation:

You save the most money with option D. Not in the long run though

4 0
3 years ago
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A band is receiving $650.00 for playing at a festival. Their manager takes 15% of the money received for each show, and the band
Dafna1 [17]
650-15%= 552.50 (they pay the manager 97.50) which leaves 552.50 profit 10% goes to ST(55.25 to the ST) which is 497.25 left for the band
5 0
4 years ago
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Explain what is meant by confounding. what is a lurking variable? what is a confounding variable?
miss Akunina [59]

Explain what is meant by confounding. what is a lurking variable? what is a confounding variable?

Answer:

A Confounding is the variable that is considered in a research study, and could overall influence the relations between the variables in the study. For example, students wanting to join AP English next semester were told to write a six page essay. When the students turned in their papers and teachers say the difference and grades they believed that the variable was the time that the students handed in the paper. They thought that if the student handed in their paper later than another student that they would receive a lower score, but this was not the case. When asking the students how they prepared for the paper, students replied with different answers. Those who outlined and used other literature for reference scored much higher than those who only used prior knowledge to write their essays. In this study, the lurking variable would be the presence of an outline.

Lurking variable: A variable that is not considered in a research study that could influence the relations between the variables in the study

Confounding variable: A variable that is considered in a research study that could influence the relations between the variables in the study

To Know more about Confounding Variable

brainly.com/question/28481575

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2 years ago
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Galina-37 [17]
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