Mathematics, 03.12.2021 20:30 Km13

A national survey of 2400 adult citizens of a nation found that 22 % dreaded Valentine's Day. The margin of error for the survey was 2.9 percentage points with 85 % confidence. Explain what this means

Answers

Answer from: Quest

mean, 40.6

step-by-step explanation:

Answer from: Quest

look at the picture.

$efgh\sim abcd\to2: 3$

ef : ab = 2 : 3

gf : cb = 2 : 3

gh : cd = 2 : 3

he : da = 2 : 3

∠a ≅ ∠e

∠b ≅ ∠f

∠c ≅ ∠g

∠d ≅ ∠h

$6: 3x=2: 3\to\dfrac{6}{3x}=\dfrac{2}{3}\to\dfrac{2}{x}=\dfrac{2}{3}\to2x=(2)(3)\to x=3$

use pythagorean theorem:

$a^2=8^2+(2\cdot3)^2\\\\a^2=64+36\\\\a^2=100\to a=\sqrt{100}\to a=10\ cm$

the length of the abcd trapezoid sides:

|ab| = 3 cm

|bc| = 10 cm

|cd| = 3(3) cm = 9 cm

|da| = 8 cm

the perimeter of abcd = 3 + 10 + 9 + 8 = 30 cm

the ratio of perimeters of the tarapezoids is equal 2 : 3.

$p_{efgh}: p_{abcd}=2: 3\to\dfrac{p_{efgh}}{p_{abcd}}=\dfrac{2}{3}$

substitute:

$\dfrac{p_{efgh}}{30}=\dfrac{2}{3}$ cross multiply

$3p_{efgh}=(30)(2)$ divide both sides by 3

$p_{efgh}=20\ cm$

$p_{abcd}=30\ cm\\\\p_{efgh}=20\ cm$

Answer from: Quest

17,000 is the correct answer.

Answer from: Quest

answer: the answer is c and e and i know because i just took the quiz

step-by-step explanation:

Other questions on the subject: Mathematics

Mathematics, 21.06.2019 17:00, krharris

Drag the tiles to the correct boxes to complete the pairs. match the cart-coordinates with their corresponding pairs of y-coordinates of the unit circle

Answers: 3

continue

Mathematics, 22.06.2019 00:20, mandi795

The circle below is centered at the point (3, 1) and has a radius of length 2. what is the equation?

Answers: 1

continue

Mathematics, 22.06.2019 03:30, fluffypuppies24

Find the derivative of the function

Answers: 1

continue

Mathematics, 22.06.2019 04:50, cass8947

What is the equation of the line written in general form? 0-x+y-2-2 ox+y-2=0 02x+4-2=0

Answers: 2

continue

You know the right answer?

A national survey of 2400 adult citizens of a nation found that 22 % dreaded Valentine's Day. The ma...

Questions in other subjects:

Mathematics, 18.10.2019 17:30

Suppose your friend multipled 1.2 and 2.6 and got 31.2. is that reasonable?...

Health, 18.10.2019 17:30

Choice of footwear can have a remarkable affect on the performance of athletes in a variety of olympic sports....

English, 18.10.2019 17:30

What is an example of the influence of greek mythology and symbols on our culture?...

Mathematics, 18.10.2019 17:30

Write y=1/8x+7 in standard form using intergers a) 8x-y=56 b) -x+8y=56 c) -x+8y=7 d) -x-8y=56...

Mathematics, 18.10.2019 17:30

Prove: if the diagonals of a quadrilateral bisect each other, then the quadrilateral is a parallelogram. abcd is a parallelogram. (fill in the blanks of th...

Mathematics, 18.10.2019 17:30

A.) find the value of x in the equation: x/2 = 15 explaining each step and explaining how to check your answer. b.) write an equation to solve the following then solve...

Physics, 18.10.2019 17:30

Acar with a mass of 1.2 × 103 kilograms starts from rest and attains a speed of 20 meters/second in 5 seconds. what net force acted on the car to cause that acceleration? . a. 3.0...

Mathematics, 18.10.2019 17:30

In georgia you are not allowed to drive until you are 16 years or older. write an inequality to express how old you must be to drive....

Physics, 18.10.2019 17:30

The pressure, volume, and temperature of a mole of an ideal gas are related by the equation pv = 8.31t, where p is measured in kilopascals, v in liters, and t in kelvins. use diffe...

Mathematics, 18.10.2019 17:30

Find the area of a sector that has a central angle of 40 and a radius of 2 cm. round your answer to the nearest 100th. use 3.14=...

More questions: Mathematics Another questions