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3 years ago

I need help in stw with twine peaks ssd's tell me ur epic and so u can help me

Mathematics

1 answer:

Gekata [30.6K]3 years ago

3 0

Answer:

wpic

Step-by-step explanation:

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A Simple random sample of 100 8th graders at a large suburban middle school indicated that 84% of them are involved with some ty

Setler [38]

Answer: a) (0.755, 0.925)

Step-by-step explanation:

Let p be the population proportion of 8th graders are involved with some type of after school activity.

As per given , we have

n= 100

sample proportion: $\hat{p}=0.84$

Significance level : $\alpha= 1-0.98=0.02$

Critical z-value : $z_{\alpha/2}=2.33$ (using z-value table)

Then, the 98% confidence interval that estimates the proportion of them that are involved in an after school activity will be :-

$\hat{p}\pm z_{\alpha/2}\sqrt{\dfrac{\hat{p}(1-\hat{p})}{n}}$

i.e. $0.84\pm (2.33)\sqrt{\dfrac{0.84(1-0.84)}{100}}$

i.e. $\approx0.84\pm 0.085$

i.e. $(0.84- 0.085,\ 0.84+ 0.085)=(0.755,\ 0.925)$

Hence, the 98% confidence interval that estimates the proportion of them that are involved in an after school activity : a) (0.755, 0.925)

3 0

3 years ago

Which function below is the inverse of f(x) = x^2-9

USPshnik [31]

To find the inverse
replace f(x) with y
switch all x and y
solve for y
replace y with f⁻¹(x)

f(x)=x^2-9
y=x^2-9
x=y^2-9
x+9=y^2
sqrt both sides
$\sqrt{x+9}$
replace
f⁻¹(x)= $\sqrt{x+9}$

that is the inverse

5 0

3 years ago

Can someone help with this question please?

Ilia_Sergeevich [38]

Answer:

D. x = 5

Step-by-step explanation:

I graped the equation on the graph below.

If this answer is correct, please make me Brainliest!

5 0

4 years ago

Which polynomial is the product of (4x+1) and (3x+2)?

maria [59]

$(4x+1)(3x+2)\\\\=4x \times 3x+4x \times 2 + 1 \times 3x + 1 \times 2\\\\ = 12x^2+8x+3x+2\\\\ = 12x^2+11x+2$

Answer A

8 0

3 years ago

A ladder 15 feet long leans against the top of a structure at a 60 degree angle to the ground. What is the height of the buildin

Goshia [24]

Answer:

height of the building is 12.99 feet.

Step-by-step explanation:

given, try to analyse:

ladder 15 feet long.
60 degree angle to the ground.

the height of the building is opposite to the angle 60° and given hypotenuse, the ladder of 15 feet long.

using sine rule:

$sin(x) = \frac{opposite}{hypotenuse}$

$sin(60) = \frac{opposite}{15}$

$opposite = sin(60) *15$

$opposite = 12.99feet$

Therefore the height of the building is 12.99 feet.

7 0

2 years ago

Read 2 more answers