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3 years ago

-6.4 = z/6what does z =?

Mathematics

1 answer:

Alecsey [184]3 years ago

4 0

Answer:

-38.4

Step-by-step explanation:

Multiply both sides by 6 to get rid of the /6 then you would get z alone

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2 years ago

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3 years ago

-4(2z+6)-12=4. HAAAAAAAAALP. please include explanation.

Phoenix [80]

Answer:

Step-by-step explanation:

-4(2z+6)-12 = 4

=> -8z - 24 - 12 = 4

=> -8z = 4 + 12 + 24

=> -8z = 40

$= > z = \frac{40}{ - 8}$

=> z = - 5 (Ans)

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2 years ago

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On a test that has a normal distribution, a score of 19 falls one standard deviation below the mean, and a score of 40 falls two

nexus9112 [7]

Hi there!

We can use the following equation:

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

z = amount of standard deviations away a value is from the mean (z-score)

σ = standard deviation

x = value

μ = mean

Plug in the knowns for both and rearrange to solve for the mean:

$-1 = \frac{19-\mu}{\sigma}\\\\-\sigma = 19 - \mu\\\\ \sigma = -19 + \mu$

Other given:

$2 = \frac{40-\mu}{\sigma}\\\\2\sigma = 40- \mu\\\\ \sigma = 20 - \frac{\mu}{2}$

Set both equal to each other and solve:

$-19 + \mu = 20 - \frac{\mu}{2}\\\\\frac{3\mu}{2} = 39 \\\\3\mu = 78 \\\\\boxed{\mu = 26 }$

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2 years ago

A system of two equations is shown below. What will you need to multiply the

Inessa [10]

In order to solve this equation you must eliminate one of the variables.

By multiplying by -3 you eliminate the y variable, making A the correct answer.
-6x-3y=-66
5x+3y=29
-x=-37
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If you would like further explanation let me know. :)

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3 years ago

-6.4 = z/6what does z =?​

-6.4 = z/6what does z =?