1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
Vanyuwa [196]
4 years ago
6

Beijing has 20.720.720, point, 7 million people and an area of 16,400\text{ km}^216,400 km 2 16, comma, 400, space, k, m, start

superscript, 2, end superscript. Shanghai has 23.723.723, point, 7 million people and an area of 6300\text{ km}^26300 km 2 6300, space, k, m, start superscript, 2, end superscript. How many times as great is the population density of Shanghai as Beijing?
Mathematics
1 answer:
Drupady [299]4 years ago
6 0

Answer:

The population density of Shanghai is 2.98 times greater than the population density of Beijing

Step-by-step explanation:

we know that

To find the population density, divide the total number of people by the area

step 1

Find the population density of Beijing

\frac{20,700,000}{16,400}=1,262.2\frac{people}{km^{2}}

step 2

Find the population density of Shanghai

\frac{23,700,000}{6,300}=3,761.9\frac{people}{km^{2}}

step 3

Divide the population density of Shanghai by the population density of Beijing

3,761.9/1,262.2=2.98

therefore

The population density of Shanghai is 2.98 times greater than the population density of Beijing

You might be interested in
Solve the equation 6 = -9 – 6x for x.
Evgesh-ka [11]

Answer:

a. -5/2

Step-by-step explanation:

8 0
3 years ago
A diner charges $0.80 per egg and $3.00 for three pancakes. Another diner charges $5.00 for three pancakes and $0.30 per
Elanso [62]

Answer:

If the eggs cost $0.80 per egg, then that'll be 9 eggs and for eggs costing $0.30, it would be 4 eggs to make each place cost the same

8 0
3 years ago
Which is the simplified form of r^-7 + s^-12? arrows to the left of -7 and -12 represent exponents,
polet [3.4K]

a^{-b}=\dfrac{1}{a^b}\\\\ r^{-7}+s^{-12}=\dfrac{1}{r^7}+\dfrac{1}{s^{12}}\implies \text{D}

7 0
3 years ago
Read 2 more answers
I need help with 1-9! please help
Sav [38]

1-First let’s list the numbers between 210 to 220, except the even ones since they’re a multiple of 2:

211; 213; 215; 217; 219

Let’s remove 213, and 219 because they’re multiples of 3 (2+1+3=6; 2+1+9=12), 215 is multiple of 5, so let’s remove it.

That leave’s is with 211, and 217.

We can remove 217, because it’s a multiple of 7, leaving us with 211.

2- It’s deductive reasoning, because you started with a more general idea.

3- {-7, -6, -5, -4, -3, -2, -1, 0, 1}

4- {x e R, x>=-2}

5-{-1, 0, 1}

6- {x∣-4≤ x ≤6}

7- [-20, ♾ )

8- On a number line, make a circle around -1, and continue the line to minus infinity.

9- On a number line, make a circle on -3, and continue to minus infinity. Make a ring on 0, and continue to infinity.

7 0
3 years ago
Suppose that time spent on hold per call with customer service at a large telecom company is normally distributed with a mean µ
lana66690 [7]

Answer:

0.3108 is the probability that the sample mean is between 7.8 and 8.2 minutes.    

Step-by-step explanation:

We are given the following information in the question:

Mean, μ = 8 minutes

Standard Deviation, σ = 2.5 minutes

Sample size, n = 25

We are given that the distribution of  time spent is a bell shaped distribution that is a normal distribution.

Formula:

z_{score} = \displaystyle\frac{x-\mu}{\sigma}

Standard error due to sampling =

=\dfrac{\sigma}{\sqrt{n}} = \dfrac{2.5}{\sqrt{25}} = 0.5

P(sample mean is between 7.8 and 8.2 minutes)

P(7.8 \leq x \leq 8.2)\\\\ = P(\displaystyle\frac{7.8 - 8}{0.5} \leq z \leq \displaystyle\frac{8.2-8}{0.5})\\\\ = P(-0.4 \leq z \leq 0.4})\\\\= P(z < 0.4) - P(z < -0.4)\\\\= 0.6554 -0.3446= 0.3108

0.3108 is the probability that the sample mean is between 7.8 and 8.2 minutes.

4 0
4 years ago
Other questions:
  • What 78974 divided bi 21?
    13·2 answers
  • At tire depot A pair of new tires sells for $216 The managers special advertises the same tires selling at a rate of $380 for fo
    8·1 answer
  • Cheryl solved a problem: 84 ÷ 0.01 = 8,400.
    13·1 answer
  • 2. If the temperature outside is 30°C, what is the<br> temperature in °F?
    9·2 answers
  • P= $16,000, r= 10%, t= 180 days<br> Assume 360 days in a year.
    10·2 answers
  • VVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVV this is middle school math
    13·1 answer
  • Okay, After this i'm done asking for help. I hope..
    12·2 answers
  • What is the slope of a line that is perpendicular to the line<br> y = 2x – 6?
    12·1 answer
  • What is m∠A? ???????
    15·1 answer
  • I need to find the table of -csc theta
    11·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!