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3 years ago

(-26) + (+6) - (-67)

Mathematics

1 answer:

Ira Lisetskai [31]3 years ago

7 0

Answer:

Step-by-step explanation:

1. (-26) + (6)=20

2. = -20-(67)

3. -20-(67)=87

4. -87

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Determine the point estimate of the population mean and margin of error for the confidence interval.Lower bound is 22, upper bou

irakobra [83]

Answer: The point estimate of the population mean is 25.

The margin of error for the confidence interval is 3 .

Step-by-step explanation:

The confidence interval for population mean is given by :-

$(\overline{x}-E , \overline{x}+E)$ , here $\overline{x}$ is the point estimate of the population mean and E is the margin of error .

As per given , we have

Lower bound of CI = $\overline{x}-E =22$ (1)

Upper bound of CI = $\overline{x}+E =28$ (2)

Add (1) and (2) , we get

$2\overline{x}=50\\\Rightarrow\ \overline{x}=25$

Subtract (1) from (2) , we get

$2E=6\\\Rightarrow\ E=3$

Hence, the point estimate of the population mean is 25.

The margin of error for the confidence interval is 3 .

6 0

3 years ago

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PLEASE ANSWER ASAP FOR BRAINLIEST

zavuch27 [327]

Answer:

x = 27 Degrees

Step-by-step explanation:

So let's just explain this without including all the theorems

ACB = JCG e vertical angles

ABC = 90 Degrees e right angle

90 + 63 = 153 => keep 153

e angles of a triangle = 180 degrees total

180 - 153 = 27

27 degrees

hope this helps!

5 0

4 years ago

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1) If y = x3 + 2x and dx/ dt = 5, find dy/dt when x = 2. Give only the numerical answer. For example, if dy, dt = 3, type only 3

Semenov [28]

Answer:

a) 70

b) 10π ft²/ft

c) 0.24 ft/sec

Step-by-step explanation:

1) y = x³ + 2x

$\frac{dy}{dt}=\frac{d(x^3+2x)}{dt}$

$\frac{dy}{dt}$ = $3x^2\frac{dx}{dt}+2\frac{dx}{dt}$

at $\frac{dx}{dt}=5$ and x = 2

$\frac{dy}{dt}$ = $3(2)^2\times(5)+2\times(5)$

$\frac{dy}{dt}$ = 60 + 10 = 70

2) A = πr² ft²

$\frac{dA}{dr}=\frac{d(\pi r^2)}{dr}$

$\frac{dA}{dr}$ = 2(πr)

at r = 5 ft

$\frac{dA}{dr}$ = 2(π × 5) ft²/ft

$\frac{dA}{dr}$ = 10π ft²/ft

3) From Pythagoras theorem

Base² + Perpendicular² = Hypotenuse²

Thus,

B² + P² = H² .............(1)

here, H = length of the ladder

P is the height of the wall

B is the distance from the wall at bottom

B² + P² = 25² ...........(1)

at B = 20 ft

20² + P² = 25²

P² = 625 - 400

P = √225

P = 15 ft

differentiating (1) with respect to time, we get

$2B\frac{dB}{dt}+2P\frac{dP}{dt}=0$

at B = 20 ft, $\frac{dB}{dt} = 0.18$ and P = 15 ft

⇒ 2(20)(0.18) + $2(15)\frac{dP}{dt}$ = 0

$30\frac{dP}{dt}$ = - 7.2

$\frac{dP}{dt}$ = - 0.24 ft/sec (Here negative sign depicts the ladder slides down)

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4 years ago

No links please need help

maxonik [38]

He literally or she sorry by the way but they said clearly no links they should kick people with that

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3 years ago

At which angle will the hexagon rotate onto itself? 60° 90° 120° 180°

velikii [3]

Answer:

Step-by-step explanation:

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3 years ago

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