A Lights-A-Lot quality inspector examines a sample of 30 strings of lights and finds that 8 are defective.

Mathematics

1 answer:

Darya [45]3 years ago

8 0

A , what’s is a experimental probability that a string of lights is defective .

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7x^2=9+x what are the values of x Will give medal and points

DENIUS [597]

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7x² - x = 9 Subtract 9 from both sides
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a = 7 , b = -1 , c = -9

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x = $\frac{- (-1) \pm \sqrt{(-1)^2 - 4(7)(-9)} }{2(7)}$ Cancel out the double negative
x = $\frac{1 \pm \sqrt{(-1)^2 - 4(7)(-9)} }{2(7)}$ Square -1
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x = $\left \{ {{ \frac{1 + \sqrt{253} }{14} } \atop { \frac{1 - \sqrt{253} }{14} }} \right.$
The approximate square root of 253 is 15.905973.
x ≈ $\left \{ { \frac{1 + 15.905973}{14} } \atop { \frac{1 - 15.905973}{14} }} \right$ Add and subtract
x ≈ $\left \{ {{ \frac{16.905973}{14} } \atop { \frac{14.905973}{14} }} \right.$ Divide
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x ≈ $\left \{ {{1.21} \atop {1.06}} \right.$

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Alexxandr [17]

Answer:

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Step-by-step explanation:

y=mx + b where m is the slope

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