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OLEGan [10]
4 years ago
7

Solve log2 ( x - 1 ) + log2 ( x + 1 ) = 3 check answers are in domain

Mathematics
1 answer:
alexdok [17]4 years ago
6 0
The answer is x=3, It doesn't have any domain restrictions, Therefore it covers all real numbers x<span>∈R</span>
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Sports jacket cost 100 dollars at 30 percent off what is the amount of discount
Sophie [7]

Answer:

334

Step-by-step explanation:

because 30% of 334=100

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3 years ago
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When Brandon was told that he correctly answered 80 percent of the items on a math achievement test, he asked how his performanc
vekshin1

Answer:

The answer is standardization.

Step-by-step explanation:

Achievement tests are used in describing students’ learning abilities and academic accomplishments.

Since standardized achievement tests can give a better indication of students’ weaknesses, the test results will corroborate what can be seen on a daily basis, and the results can give insight into how a student's achievement compares to the average national student.

So, Brandon's concern was directly related to the issue of standardization because he wanted to make sure the test fulfilled the requirements of a standardized test ( i.e the questions, conditions for administering, scoring procedures, and interpretations) were consistent, and if so his score would not deviate greatly from the average test taker, and he wouldn't be an exception in obtaining such a high score.

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3 years ago
Group Work 2.6 Newton's Law of Cooling states that an object cools at a rate proportional to the difference between the temperat
Airida [17]

Answer:

ΔT = ΔT0 e^-K T

As I understand Newton's Law of Cooling

ΔT at any time is the difference between the temperature and the surroundings

Originally       ΔT0 = 95 - 22   difference between 95 and room temperature

65 - 22 = 33 = 73 e^-KT      where t is time to cool to 65 deg

ln (33/73) = -KT       K = .794 / 5 = .159    where 5 is time to cool to 65 deg

40 - 22 = 73 e^-.159 T      where t is time to cool to 40 deg

18 = 73 e^-.159 T

ln (18 / 73) = -.159 T

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Suppose the object cooled from 95 to 90 deg, then

ln 68 / 73 = -.159 T     and T = .45 min

7 0
3 years ago
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Sveta_85 [38]

Answer:

Correct answer is C.

Step-by-step explanation:

visual diagram of perpendicularness->

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                                                                         |

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                                                                         |

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6 0
3 years ago
What is the sum of the first seven terms of the geometric series where a1 = 10 and r = −2?
lbvjy [14]

Answer:

  • 430

Step-by-step explanation:

<h3>Given GP with:</h3>
  • a1 = 10
  • r = -2
<h3>To find</h3>
  • S7
<h3>Solution</h3>

<u>Formula of sum:</u>

  • Sn = a1(r^n - 1)/(r - 1)

<u>Substitute values:</u>

  • S7 = 10((-2)^7 - 1)/(-2 - 1) = 10(- 128 - 1)/(-3) = 10*129/3 = 430
5 0
3 years ago
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