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3 years ago

Solve by factoring 4x^2-25=0

1 answer:

3 0

   4x² - 25 = 0
      4x² - 10x + 10x - 25 = 0
2x(2x) - 2x(5) + 5(2x) - 5(5) = 0
      2x(2x - 5) + 5(2x - 5) = 0
   (2x + 5)(2x - 5) = 0
   2x + 5 = 0 U 2x - 5 = 0
       - 5 - 5 + 5 + 5
       2x = -5    2x = 5
      2 2 2    2
   x = -2¹/₂    x = 2¹/₂

Solution Set: {-2¹/₂, 2¹/₂}

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3 years ago

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<h3>Z score</h3>

Z score is used to determine by how many standard deviations the raw score is above or below the mean. It is given by:

$z=\frac{x-\mu}{\sigma }$

Where x is raw score, μ is mean, σ is standard deviation

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for x = 56:

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The corresponding z score for speed of 62 mph, 47 mph, and 56 mph is 1.5, -2.25 and 0 respectively.

Find out more on Z score at: brainly.com/question/25638875

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