All categories

2 years ago

The sum of twice a number and 1 is -3, find the number

Mathematics

2 answers:

stellarik [79]2 years ago

8 0

Answer:

-2

Step-by-step explanation:

Andreyy892 years ago

8 0

Answer:

-1

Step-by-step explanation:

-3 +1 =-2

-2/2=-1

Hope this is correct and helps!

You might be interested in

The circle below is centered at the origin and has a radius of 4. What is its equation?

Alecsey [184]

Answer:

C) x^2 + y^2 = 16

Step-by-step explanation:

<h2><u>Find the equation </u></h2>

since the radius is 4 this means that anywhere from the center of the circle to the edge of the circle is 4. hence :

place the horizontal line of the radius where y = 0 .

this means that if y = 0 , then x = 4

therefore :

x^2 + y^2

4^2 + 0^2

= 16

<h3><u>hence the answer is C ) x^2 + y^2 = 16</u></h3>

7 0

3 years ago

How do you divide 9,962 and 41 how do you divide 909900 + 62 + 41

7nadin3 [17]

242.975609756 I don't know about the last one though.

5 0

3 years ago

Find the quotients<br><br> Thank you

svlad2 [7]

Answer:

The answer to your question is below

Step-by-step explanation:

5) 2x² -7x + 34

x + 5 2x³ + 3x² - x + 1

-2x³ -10x²

0 - 7x² - x

+7x² +35x

0 +34x + 1

-34x - 170

0 - 160

Quotient = 2x² - 7x + 34

Remainder = -160

6) 2x² - 3x + 1

3x + 1 6x³ - 7x² + 0x + 2

-6x³ -2x²

0 -9x² + 0x

+9x² +3x

0 +3x + 2

- 3x - 1

0 + 1

Quotient = 2x² - 3x + 1

Remainder = 1

7 0

2 years ago

create a divison problem with a 2-digit divisor using more than 1 set of compatible numbers, observe what happen when you estima

liubo4ka [24]

Here Is A Dividend That Might Help Is 12÷6=2

4 0

3 years ago

It is known that the population variance equals 484. With a .95 probability, the sample size that needs to be taken if the desir

Ksju [112]

Answer:

We need a sample size of at least 75.

Step-by-step explanation:

We have that to find our $\alpha$ level, that is the subtraction of 1 by the confidence interval divided by 2. So:

$\alpha = \frac{1-0.95}{2} = 0.025$

Now, we have to find z in the Ztable as such z has a pvalue of $1-\alpha$ .

So it is z with a pvalue of $1-0.025 = 0.975$ , so $z = 1.96$

Now, we find the margin of error M as such

$M = z*\frac{\sigma}{\sqrt{n}}$

In which $\sigma$ is the standard deviation of the population and n is the size of the sample.

The standard deviation is the square root of the variance. So:

$\sigma = \sqrt{484} = 22$

With a .95 probability, the sample size that needs to be taken if the desired margin of error is 5 or less is

We need a sample size of at least n, in which n is found when M = 5. So

$M = z*\frac{\sigma}{\sqrt{n}}$

$5 = 1.96*\frac{22}{\sqrt{n}}$

$5\sqrt{n} = 43.12$

$\sqrt{n} = \frac{43.12}{5}$

$\sqrt{n} = 8.624$

$(\sqrt{n})^{2} = (8.624)^{2}$

$n = 74.4$

We need a sample size of at least 75.

6 0

3 years ago

Read 2 more answers