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alexgriva [62]
2 years ago
6

2d +9= 19 The solution is d =

Mathematics
1 answer:
Novosadov [1.4K]2 years ago
6 0

{\huge{\boxed{\mathbb{QUESTION}}}

2d +9= 19

The solution is d =

{\huge{\boxed{\mathbb{ANSWER\:WITH\:EXPLANATION}}}

Hello there, first we can place our equation, which you have stated

2d+9=19, this algebra, in algebra we want to find the exact value of the variable, or have the variable on one side of the equation.

First we can subtract 9 with both sides of the equation giving us the result of 2d=10, this can also be represented as 2\cdot d=10, now just divide both sides of the equation by 2, our answer is d=5.

_____________________

{\huge{\boxed{\mathbb{ANSWER}}}

  • {\boxed{d=5}}

_____________________

<h3><em>Have a good day :) !</em></h3>
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A marketing researcher wants to find a 96% confidence interval for the mean amount those visitors spend per person per day while
ki77a [65]

Answer:

n=(\frac{2.054(12)}{4})^2 =37.97 \approx 38

So then the minimum sample to ensure the condition given is n= 38

Step-by-step explanation:

Notation

\bar X represent the sample mean for the sample  

\mu population mean (variable of interest)

\sigma=12 represent the population standard deviation

n represent the sample size  

ME = 4 the margin of error desired

Solution to the problem

When we create a confidence interval for the mean the margin of error is given by this formula:

ME=z_{\alpha/2}\frac{\sigma}{\sqrt{n}}    (a)

And on this case we have that ME =4 and we are interested in order to find the value of n, if we solve n from equation (a) we got:

n=(\frac{z_{\alpha/2} \sigma}{ME})^2   (b)

The critical value for 96% of confidence interval now can be founded using the normal distribution. The significance is \alpha=1-0.96 =0.04. And in excel we can use this formula to find it:"=-NORM.INV(0.02;0;1)", and we got z_{\alpha/2}=2.054, replacing into formula (b) we got:

n=(\frac{2.054(12)}{4})^2 =37.97 \approx 38

So then the minimum sample to ensure the condition given is n= 38

5 0
3 years ago
If an angle is 40 , then it is acute
Firdavs [7]

Yes, an angle less than 90 degrees is acute.

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3 years ago
Find the coordinates of G if F(2,5) is the midpoint of line GJ and J and has coordinates (-2,8)
dimulka [17.4K]

Answer:

G(6,2)

Step-by-step explanation:

If point F(x_F,y_F) is the midpoint of the segment GJ, where G(x_G,y_G) and J(x_J,y_J), then

x_F=\dfrac{x_G+x_J}{2},\\ \\y_F=\dfrac{y_G+y_J}{2}.

In your case,

F(2,5),\ J(-2,8),

therefore,

2=\dfrac{x_G+(-2)}{2},\\ \\5=\dfrac{y_G+8}{2}.

Thus,

x_G-2=4\Rightarrow x_G=6,\\ \\y_G+8=10\Rightarrow y_G=2.

4 0
3 years ago
What is the last digit of the product of all the numbers between 11 and 29?
tekilochka [14]

we can conclude that the last digit of the product of all the numbers between 11 and 29 is 0.

<h3>What is the last digit of the product of all the numbers between 11 and 29?</h3>

Here we want to find the last digit of the product between all the whole numbers larger than 11 and smaller than 29.

Then we have the product:

P = 12*13*14*15*16*17*18*19*20*21*22*23*24*25*26*27*28

Now, notice that there is a 20 there.

Any number times 20 will end with a zero, then:

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Only with that, we can conclude that the last digit of the product of all the numbers between 11 and 29 is 0.

If you want to learn more about products:

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5 0
1 year ago
Directions: Choose the letter of the correct answer.
Bezzdna [24]

Answer:

Step-by-step explanation:

1) y = 3x -------------(I)

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Plug in y= 3x in equation (II)

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      5 = x

x= 5

Plug in s = 5 in equation (I)

y = 3*5 = 15

x = 5

y = 15

4 0
3 years ago
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