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3 years ago

Find the sum of the given polynomials. 3x ^2 + 2x - 5 and -4 + 7x ^2

Mathematics

2 answers:

Yakvenalex [24]3 years ago

8 0

Answer:

10x^2 +2x -9

Step-by-step explanation:

Group things that are alike and simplify

(3x^2+7x^2) = 10x^2

(2x) nothing to add or subtract with it so it stays positive 2x= +2x

(-5-4) = -9

Then put the answer from highest degree to lowest

UNO [17]3 years ago

4 0

That I’d right that’s what I got

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yanalaym [24]

Answer:

1. Benny had 266 dollars to spend on 9 books. After buying them, he had 14 dollars. How much did each book cost?

The books cost $28 dollars each.

how to calculate...

$266 - $14 = $252

then take $252 divided by 9 = $ 28

2. Oceanside Bike Rental Shop charges 14 dolars plus 9 dollars an hour for renting a bike. Sally paid 86 dollars to rent a bike. How many hours did she pay to have the bike checked out?

8 hours

how to calculate...

take 86 - 14 = 72

then 72 divided 9 = 8 hours

3. The sum of three consecutive numbers is 132. What is the smallest of the three numbers?

43 is the smallest of the 3 numbers

calculation...

x + (x+1) + (x+2) = 132

3x + 3 = 132 -3

3x=129

x=129/3

x=43 (answer for the 1st number)

43+1=44 (answer for the 2nd number)

43+2=45 (answer for the 3rd number)

add them all to make sure they equal to 132

43+44+45=132

132=132

4. Sandy sold half of her comic books and then bought 8 more. She now has 16. How many did she begin with?

x= how many Sandy started with

1/2 x + 8 = 16

1/2x = 16 - 8

1/2x = 8 * 2

x = 16 comics books

Step-by-step explanation:

6 0

3 years ago

HELP ME PLEASEE

babymother [125]

From the given discrete distribution, we have that:

$\mu = 2.13, \sigma^2 = 0.61, \sigma = 0.78$

<h3>What are the mean, the variance and the standard deviation of a discrete distribution?</h3>

The mean of a discrete distribution is given by the sum of each outcome multiplied by it's respective probability.

The variance is given by the sum of the difference squared between each observation and the mean, divided by the number of values.

The standard deviation is the square root of the variance.

In this problem, the distribution is:

$P(X = 1) = \frac{2}{8}$

$P(X = 2) = \frac{3}{8}$

$P(X = 3) = \frac{3}{8}$

Hence, the mean is:

$\mu = 1\frac{2}{8} + 2\frac{3}{8} + 3\frac{3}{8} = \frac{17}{8} = 2.13$

The variance is:

$\sigma^2 = (1-2.13)^2\frac{2}{8} + (2-2.13)^2\frac{3}{8} + (3-2.13)^2\frac{3}{8} = 0.61$

The standard deviation is:

$\sigma = \sqrt{0.61} = 0.78$

More can be learned about discrete distributions at brainly.com/question/24855677

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2 years ago

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ohaa [14]

Answer:

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Step-by-step explanation:

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kompoz [17]

Answer:

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Step-by-step explanation:

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3 years ago