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kvv77 [185]
3 years ago
14

Which expression is equivalent to -3x + 9?

Mathematics
2 answers:
Olenka [21]3 years ago
4 0

Answer:

B

Step-by-step explanation:

You use the distributive Property

-3(x-3)

-3x+9

VMariaS [17]3 years ago
4 0
B. -3(x-3) this is because -3 times x is -3x and -3 times -3 would result in a positive 9.
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A random sample of adult female reaction times has a sample mean of x¯=394.3 milliseconds and sample standard deviation of s=84.
s2008m [1.1K]

Answer:

99.7%

Step-by-step explanation:

Given that mean (μ) = 394.3 ms and standard deviation (σ) = 84.6 ms.

The empirical rule states that for a normal distribution:

  1. 68% falls within one standard deviation (μ ± σ)
  2. 95% falls within two standard deviation (μ ± 2σ)
  3. 99.7% falls within three standard deviation (μ ± 3σ)

one standard deviation = 394.3 ± 84.6 = (309.7, 478.9). 68% falls within 309.7 and 478.9 ms

two standard deviation = 394.3 ± 2 × 84.6 = (225.1, 563.5). 95% falls within 225.1 and 563.5 ms

three standard deviation = 394.3 ± 3 × 84.6 = (140.5, 648.1). 99.7% falls within 140.5 and 648.1 ms

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IrinaVladis [17]
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"twelve decreased by twice a number" ---> 12 - 2x
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12 - 2x = 8(x + 4)
12 - 2x = 8x + 32 (distributive property)
12 = 10x + 32 (add 2x to both sides)
-20 = 10x (subtract 32 from both sides)
x = -2 (divide both sides by 10)
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