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4 years ago

Add the polynomials

Mathematics

1 answer:

7nadin3 [17]4 years ago

6 0

Answer:

5x^4 + 3x^2 + 4x

Step-by-step explanation:

Basically what your doing is 5x^4 + 4x - 6 + 3x^2 + 6

There aren't any common things we can add apart from the - 6 and 6

So do

-6 + 6 = 0

You end with the answer

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30% of the cars in a particular parking lot are red. if there are 12 red cars, how many cars are parked in the parking lot?

Over [174]

$\frac{12}{x} = \frac{30}{100}$
then cross multiply which gives you
$30x=1200$ divide each side by 30 to make the x by itself
which gives you the answer x=40

7 0

3 years ago

Read 2 more answers

The mean life of a particular brand of light bulb is 1200 hours. If you know that at about 95% of this brand of bulbs will last

Pachacha [2.7K]

Answer:

c) 50

Step-by-step explanation:

We have been given that the mean life of a particular brand of light bulb is 1200 hours. About 95% of this brand of bulbs will last between 1100 and 1300 hours.

We will use z-score formula to solve our given problem.

$z=\frac{x-\mu}{\sigma}$ , where,

$z=\text{z-score}$ ,

$x=\text{Sample score}$ ,

$\mu=\text{Mean}$ ,

$\sigma=\text{Standard deviation}$

We know that 95% of data points lies within two standard deviation of mean, so 1100 will correspond to a z-score of -2 and 1300 will correspond to a z-score of 2.

$-2=\frac{1000-1200}{\sigma}$

$-2=\frac{-100}{\sigma}$

$\sigma=\frac{-100}{-2}$

$\sigma=50$

We can use sample score 1300 and get same answer as:

$2=\frac{1300-1200}{\sigma}$

$2=\frac{100}{\sigma}$

$\sigma=\frac{100}{2}$

$\sigma=50$

Therefore, the standard deviation of the light bulbs’ life is 50 years.

4 0

4 years ago

Unit Rates-which is the better buy? 13 points!

Yuri [45]

16 - option a : 0.83
option b: 0.8

5 bars of soap for $4

17 - the 50 penguins for 795 usd is obviously the better choice

If you need to be more specific just ask me

6 0

4 years ago

Please help, this is 7th grade math

Neporo4naja [7]

Answer:

its -1 and 3/4

Step-by-step explanation:

because u have to find a common denominator first and then a negative plus a positive is a negative so i hope this helps i just learned this like two weeks ago

5 0

4 years ago

Read 2 more answers

Select the correct answer.

mash [69]

Answer:

The answer is B because it's all real numbers since it won't stop

Step-by-step explanation:

5 0

3 years ago