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zalisa [80]
3 years ago
12

Simplify (X2/3) ^4/5

Mathematics
1 answer:
Flura [38]3 years ago
7 0

The answer to your questions is x8/15. Hope this helps!

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Which of the following explains the relationship between angles B and C? Lines JK and JM intersect at point J, creating four ang
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Adjacent angles

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What is the measure of XYZ?<br> O A. 75°<br> O B. 56.5°<br> O C. 38°<br> O D. 76
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A figure is shown with parallel lines a and b. What is the measure, in degrees, of ∠r?
Novay_Z [31]

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PLEASE HELP!!This is joshs solution for the equation x^2-6x-7=0: x^2-6x-7=0
iren [92.7K]

Answer:

  no. see below

Step-by-step explanation:

This much of Josh's working is correct:

  x^2-6x=7

  x^2-6x+9=7+9

  (x-3)^2=16

At this point Josh apparently overlooked the fact that he needed to take the square root of both sides of the equation. Had he done that, he would have ...

  x -3 = ±4

  x = 3+4 . . . or . . . 3 -4

  x = 7 or -1

_____

Josh reported values of x that would match ...

  x -3 = ±16

He <em>violated the equal sign</em> by taking the square root on the left, and multiplying by ±1 on the right. Doing different operations on the two sides of the equation will mean the value of x is changed to something other than what you're looking for.

4 0
3 years ago
The cost of 11 dvds and 7 cds is 172.50 and the cost of 10 dvds and 7 cds is 155.80. How much does a cd and dvd cost?
AleksandrR [38]

Answer:

The question has a mistake

Step-by-step explanation:

11d+7c= 172.5

10d+7c= 155.8

By subtraction;

1d+ 0c = 16.7

1d = 16.7

11×16.7+7c=172.5

7c = 172.5-11*16.7

You will get a negative answer yet the cost cannot be negative.

5 0
3 years ago
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