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2 years ago

5. Find the product - 2x² (3x² - 4x+7)

Mathematics

2 answers:

garri49 [273]2 years ago

8 0

Look at the attached picture

Hope it will help you...

Good luck on your assignment

~pragya

VladimirAG [237]2 years ago

8 0

Answer:

$= - 6 {x}^{4} + 8 {x}^{3} - 14 {x}^{2}$

Step-by-step explanation:

$- 2 {x}^{2} (3 {x}^{2} - 4x + 7) \\ = - 6 {x}^{4} + 8 {x}^{3} - 14 {x}^{2}$

hope this helps

brainliest appreciated

good luck! have a nice day!!

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BRAINLIEST! Solve for k 7(9+k)

dolphi86 [110]

No sure I used Photomath hope it’s a start

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2 years ago

A company is manufacturing highway emergency ares. Such ares are sup- posed to burn for an average of 20 minutes. Every hour a s

kramer

Complete question :

A company is manufacturing highway emergency ares. Such ares are sup- posed to burn for an average of 20 minutes. Every hour a sample of ares is collected, and their average burn time is determined. If the manufacturing process is working cor- rectly, there is a 68% chance that the average burn time of the sample will be between 14 minutes and 26 minutes. The quality engineer in charge of the process believes that if 4 of 5 samples fall outside these bounds then this is a signal that the process might not be performing as expected. Each morning the sampling begins anew. Let X denote the number of samples drawn in order to obtain the fourth sample whose average value is outside of the above bounds. Find the probability that for a given morning X = 5, hence there seems to be a problem right away.

Answer:

0.0285

Step-by-step explanation:

We are to find the probability for a given morning that X = 5

From the question, we could see that there is a 68% chance that the average burn time of the sample will be between 14 minutes and 26 minutes and the success of the process is obtained after the fourth or fifth sample.

Thus, r = 4; q = 0.68

The probability average burn time falls outside p will be:

p = 1 - 0.68 = 0.32

The random variable X follows negative binomial distribution.

Therefore,

$f(x) = \left[\begin{array}{ccc}x-1\\r-1\end{array}\right] (1-p)^x^-^r) (p)^r$

Where, x = 5

r = 4

p = 0.32

Substituting figures in the equation, we have:

$P(x=5) = \left[\begin{array}{ccc}5-1\\4-1\end{array}\right] (1-0.32)^5^-^4 (0.32)^4$

$P(x=5) = \left[\begin{array}{ccc}4\\3\end{array}\right] (0.68)(0.01048576)$

= 0.0285

The probability that for a given morning X = 5 is 0.0285

4 0

2 years ago

Find 5 rational numbers between 1/3 and 2/7 and arrange in ascending order.

likoan [24]

2/7=0.2857142857

1/3=0.3333

A rational number is that number that can be expressed as a ratio of 2 integers.

The 5 numbers could be:

0.29=29/100

0.3=3/10

0.31=31/100

0.32=32/100=8/25

0.33=33/100

These numbers are not unique.

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2 years ago

Mario's locker number is between 80 and 99. the sum of the digits is 13. the tens digits is 3 more than the ones digit. What is

kvv77 [185]

Ok, hmm
possible ones are
starting with 8 or 9
adds to 13
8+5=13
9+4=13
thepossible numbers are 85 and 94
tens is 3 more than ones digit
8-5=3 true
9-4=5, not what we looking for

aswer is 85

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2 years ago

Read 2 more answers

A study will be conducted to investigate whether there is a difference in the mean weights between two populations of raccoons.

enyata [817]

Answer:

<h2>In this case,the answer would be option d) given in the answer choices or options or A two-sample t-test for a difference between population means.</h2>

Step-by-step explanation:

In Statistics,a two sample test is generally used to examine or compare two different population means with the main objective to verify whether the population means are equal or otherwise.
The two sample t-test basically involves the hypothesis testing to determine or verify the equality between two concerned population means.
In this case,the two different populations of raccoons are given and the equality of the mean sample weights of the two distinct populations can be determined or evaluated by employing the hypothesis testing method under a two sample t test for measuring difference in two population means.

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3 years ago