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3 years ago

Help plz.

Mathematics

2 answers:

vampirchik [111]3 years ago

7 0

Answer: B. 16

Step-by-step explanation:

y = 7(3) - 5

y = 21 - 5

y = 16

aivan3 [116]3 years ago

7 0

Answer: B

Steps:

If x=3

y=7(3)-5

y=21-5

y=16

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3 years ago

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zysi [14]

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3 years ago

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The standard form of Y+6=-3(×+1)

AlexFokin [52]

Answer: 3x+y=-9

Step-by-step explanation:

Step 1 is distribute y+6 = -3(x+1)

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3 years ago

Question

AlekseyPX

Answer:

The population mean is 5 volts

Step-by-step explanation:

Output voltage is assumed to be normally distributed, with standard deviation 0.25 Volts

s=0.25

n = 8

$H_0:\mu = 5\\H_a:\mu \neq 5$

Sample mean = $\bar{x}=4.85$

Since n < 30 and population standard deviation is unknown

So, we will use t test

Formula : $t = \frac{x-\mu}{\frac{s}{\sqrt{n}}}$

$t = \frac{4.85-5}{\frac{0.25}{\sqrt{8}}}$

t=-1.69

Refer the t table for p value

Degree of freedom = n-1 = 8-1 = 7

So, $t_{(df,\alpha)}=t_{7,0.05}=2.365$

P value >α

So, We are failed to reject null hypothesis

Hence The population mean is 5 volts

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4 years ago