The general form of the equation of a circle is x^2+y^2−4x−8y−5=0.

1 answer:

5 0

X² - 4x + y² - 8y = 5

Complete the square:
x² - 4x + (4) + y² - 8y + (16) = 5 + (4) + (16)
→ (x - 2)² + (y - 4)² = 25

Center: (2,4)
radius: √25 = 5

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<h3>Given information-</h3>

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The standard deviation for the bulb is 2000 hours.

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To find out the how many standard deviation is 14500 mean away from the mean the z value of the mean should be calculated.

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