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aev [14]
3 years ago
9

BRAINLIEST Enter your answer and show all the steps that you use to solve this problem.

Mathematics
1 answer:
Mandarinka [93]3 years ago
5 0

Answer:

2n + 3

Step-by-step explanation:

To find twice a number, we can do it in several ways:

  • The first is adding the number twice, in this case the number is n, so the operation would be n + n = 2n.
  • The other way is to multiply the number by 2, so 2 * n = 2n.

Then you have to add 3 to the result. The previous result was 2n so now we get:

2n + 3

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Tanya [424]

I believe the X-coordinate of the midpoint would be (0.5,-0.5)

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4 years ago
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A building manager installs sensors to see how often people turn off the lights when they leave the room. After a month the mana
vichka [17]

Answer:

D. 68%

Step-by-step explanation:

The following statistics are given;

sample mean = 47%

s = 5% ; the sample standard deviation

n = 625 ; the sample size

The confidence interval for a population mean is given as;

sample mean ± z-score*\frac{s}{\sqrt{n} }

Substituting the above values we have;

47 ± z-score*\frac{5}{\sqrt{625} }

47 ± z-score*0.2

The confidence interval has been given as;

lower limit = 46.8%

upper limit = 47.2%

We can use any of these two values with the above expression to solve for the z-score. Using the lower limit we have the following equation;

47 - z-score*0.2 = 46.8

-z-score*0.2 = 46.8 - 47

-z-score*0.2 = -0.2

z-score = 1

The area of the standard normal curve between -1 and +1 will be the confidence level for the given confidence interval.

Pr( -1<Z<1 ) = 0.68 = 68%

From the Empirical rule

6 0
4 years ago
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Find the coordinates of the midpoint of CM with endpoints C(1, -6) and M(7,5).
Vilka [71]

Answer: The coordinates of the midpoint of CM with endpoints C(1, -6) and M(7,5) are (4,-\dfrac{1}{2}).

Step-by-step explanation:

We know that the coordinates of the midpoint(x,y) of line joining A(a,b) and B(c,d) is given by :-

(x,y)=(\dfrac{a+c}{2},\dfrac{b+d}{2})  .....(i)

Given : The coordinates of endpoints of CM are C(1, -6) and M(7,5)

Then , by using (i) , the coordinates of the midpoint of CM would be :-

(\dfrac{1+7}{2},\dfrac{-6+5}{2})\\\\=(\dfrac{8}{2},\dfrac{-1}{2})\\\\=(4,-\dfrac{1}{2})

Hence,  the coordinates of the midpoint of CM with endpoints C(1, -6) and M(7,5) are (4,-\dfrac{1}{2}).

3 0
3 years ago
A compact disc cover is 14 centimeters (cm) long, 12.4cm wide, and 1 cm deep. Which of the following represents the surface area
bogdanovich [222]

Answer:

SA= 2(l x w) |+2(l x h)+2(h x w)

= 2(14 x 12.4) +2(14 x 1)+2(1x 12.4)

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Step-by-step explanation:

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What is the answer to this question? <br> (The one in the middle)
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Let f=number of field goals and a=number of points after.
a+f=38
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a+3f=70

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f=16 field goals he kicked last season.
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4 years ago
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