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3 years ago

Simplify by adding

Mathematics

1 answer:

Musya8 [376]3 years ago

5 0

Answer:

$=3x^2-3x-7$

Step-by-step explanation:

$\mathrm{Remove\:parentheses}:\quad \left(a\right)=a$

$=3x^2+2x-5x-7$

$\mathrm{Add\:similar\:elements:}\:2x-5x=-3x$

$=3x^2-3x-7$

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Elementary and secondary schools were classified by the number of computers they had.

Keith_Richards [23]

Answer:

$Probability = 0.7259$

$Probability = 0.2741$

$Probability = 0.4414$

Step-by-step explanation:

Given

The table

First, we calculate the amount of schools

$Total = 752 + 3352 + 18865 + 14016 + 46805$

$Total = 83790$

Solving (a): Probability of 75+ computers.

From the given table, schools with 75 or more computers have the population of:

$75\ or\ more = 14016 + 46805$

$75\ or\ more = 60821$

The probability is calculated as:

$Probability = \frac{75\ or\ more}{Total}$

$Probability = \frac{60821}{83790}$

$Probability = 0.7259$

Solving (b): Probability of less than 75 computers.

From the given table, schools with less than 75 computers have the population of:

$Less\ than\ 75 = 752 + 3352 +18865$

$Less\ than\ 75 = 22969$

The probability is calculated as:

$Probability = \frac{Less\ than\ 75}{Total}$

$Probability = \frac{22969}{83790}$

$Probability = 0.2741$

Solving (c): Probability of less than 10 computers.

From the given table, schools with less than 100 computers have the population of:

$Less\ than\ 100 = 752 + 3352 +18865+14016$

$Less\ than\ 100 = 36985$

The probability is calculated as:

$Probability = \frac{Less\ than\ 100}{Total}$

$Probability = \frac{36985}{83790}$

$Probability = 0.4414$

8 0

3 years ago

What is the y-coordinate for the solution to the system of equations?<br><br> {y=1/2x−4<br> {y=−2x+1

katovenus [111]

Answer:

y = -3

Step-by-step explanation:

{y = x/2 - 4

y = 1 - 2 x

Substitute y = x/2 - 4 into the second equation:

{y = x/2 - 4

x/2 - 4 = 1 - 2 x

In the second equation, look to solve for x:

{y = x/2 - 4

x/2 - 4 = 1 - 2 x

Add 2 x + 4 to both sides:

{y = x/2 - 4

(5 x)/2 = 5

Multiply both sides by 2/5:

{y = x/2 - 4

x = 2

Substitute x = 2 into the first equation:

{y = -3

x = 2

Collect results in alphabetical order:

Answer:

{x = 2

y = -3

6 0

3 years ago

What is the best definition for “sample” as used in statistics?

krok68 [10]

Answer:

a part of the population that represents the entire population

Step-by-step explanation:

8 0

3 years ago

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Frank invested $1000 in an account with a 6% interest rate compounded annually. How much is the account after 3 years?

Wewaii [24]

I belive c is the corect awnser

4 0

3 years ago

The perimeter of AABC is 13 cm. It was dilated to create<br> AA'B'C'.

lorasvet [3.4K]

Answer:

Step-by-step explanation:

that's not really a question

3 0

3 years ago