All categories

3 years ago

Help me :( it's algebra and I am so confused. (explanation would be nice)

Mathematics

2 answers:

Mekhanik [1.2K]3 years ago

7 0

Answer:

-3x^4-3x+15x^2

Hope it helps

The 1st option

gulaghasi [49]3 years ago

7 0

Answer:

- 3 $x^{4}$ + 15x² - 3x

Step-by-step explanation:

Given

(5 $x^{4}$ - 3x + 8x²) - (8 $x^{4}$ - 7x²)

Remove the parenthesis on first and distribute second by - 1

= 5 $x^{4}$ - 3x + 8x² - 8 $x^{4}$ + 7x² ← collect like terms

= - 3 $x^{4}$ + 15x² - 3x ← in standard form

You might be interested in

Describe several real world situations can be modeled by equations of the form Y equals MX plus be or Y equals MX explain how th

lara [203]

The linear equation represents y = mx + b describes several real world situations such as

Relation between printer and ink cartridges,

Relationship between number of songs and how much is left on the card.

Step-by-step explanation:

Linear equations y = mx + b.

m is your rate of change.

b is your constant. This is the initial value of y. The value of y when x is 0.

Finally, y is the thing that depends on x.

Oh right, examples:

I buy a printer for $100 and the ink cartridges cost $25 each. The relationship between ink cartridges and total cost.

total cost = 25(cartridges I buy) + 100 or y = 25x + 100

I get a $100 iTunes gift card for my birthday and then start buying $1 songs. The relationship between the number of songs I buy and how much is left on the card

amount left on card = -$1(songs bought) + 100 or y = -x +100

5 0

2 years ago

A drug company is considering marketing a new local anesthetic. The effective time of the anesthetic the drug company is current

lapo4ka [179]

Using the z-distribution, we have that:

The hypothesis test is:

$H_0: \mu = 7.4$

$H_1: \mu < 7.4$

The p-value is of 0.0668.

The critical value is $z^{\ast} = -1.28$

b) Since the test statistic is less than the critical value for the left-tailed test, there is enough evidence to conclude that the null hypothesis will be rejected.

Item a:

At the null hypothesis, it is tested if the mean is of 7.4 minutes, that is:

$H_0: \mu = 7.4$

At the alternative hypothesis, it is tested if the mean is lower than 7.4 minutes, that is:

$H_1: \mu < 7.4$

We have the standard deviation for the population, hence, the z-distribution is used.

The test statistic is given by:

$z = \frac{\overline{x} - \mu}{\frac{\sigma}{\sqrt{n}}}$

The parameters are:

$\overline{x}$ is the sample mean.

$\mu$ is the value tested at the null hypothesis.

$\sigma$ is the standard deviation of the sample.

n is the sample size.

For this problem, the values of the parameters are: $\overline{x} = 7.1, \mu = 7.4, \sigma = 1.2, n = 36$ .

Hence, the value of the test statistic is:

$z = \frac{\overline{x} - \mu}{\frac{\sigma}{\sqrt{n}}}$

$z = \frac{7.1 - 7.4}{\frac{1.2}{\sqrt{36}}}$

$z = -1.5$

Using a z-distribution calculator, the p-value is of 0.0668.

Also using a calculator, considering a left-tailed test, as we are testing if the mean is less than a value, the critical value with a significance level of 0.1 is of $z^{\ast} = -1.28$ .

Item b:

Since the test statistic is less than the critical value for the left-tailed test, there is enough evidence to conclude that the null hypothesis will be rejected.

You can learn more about the use of the z-distribution to test an hypothesis at brainly.com/question/16313918

5 0

2 years ago

What's the formula to find this?

Komok [63]

25 cubic centimeters....
Hope this helps! all you had to do it multipley

7 0

3 years ago

Read 2 more answers

A new house was purchased for $304 000. after 3 years, it's market value had increase by 28%. What is the new market value if th

loris [4]

Answer:

389,120

Step-by-step explanation:

8 0

3 years ago

Kara has 21 collectible buttons to sell. She sells the small buttons for $3 and the large buttons for $4, and earns a total of $

Serga [27]

We know that there are 21 buttons total. x is the number of small buttons and y is the number of large buttons.

Therefore, our first equation should be x+y = 21.

We know the small buttons sell for 3 dollars, meaning 3x represents how much is made from the small buttons. The larger buttons sell for 4 dollars, meaning 4y is how much is made from the large buttons.

We also know that the total of the buttons sold is 68 dollars. Therefore 3x + 4y = 68 is our second equation.

From this information, the answer is the first set.

5 0

3 years ago