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2 years ago

(-x+ 4)(3x² + 3x + 5)

Mathematics

2 answers:

ArbitrLikvidat [17]2 years ago

8 0

Answer:

-3x^3 + 9x^2 + 7x + 20

Step-by-step explanation:

(3x^2 × (-x +4)) + (3x × (-x +4)) + (5 × (-x +4))=

=-3x^3 + 9x^2 + 7x + 20

raketka [301]2 years ago

5 0

Answer:

I got -3x^3 + 9x^2 + 7x+ 20

Step-by-step explanation:

Frist do distrubtive property then combine all like terms.

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2 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

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3 years ago