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
ser-zykov [4K]
3 years ago
10

The second digit of a four digit number is "0". If you write the digits of this number backwards, you will get a number 9 times

bigger than the original. What is the original number?
Mathematics
1 answer:
wolverine [178]3 years ago
6 0

Answer:

1089

Step-by-step explanation:

The original number is A0CD, We have that DC0A = 9 x A0CD.

If A =1, then D = 9 and we have:

9C01 = 9 x 10C9

In order for this expression to be true, the following must also be true:

(C x 9) + 8 must be divisible by 10, which means that C x 9 must end in a 2.

The only multiple of 9 (from 9 to 81) that ends in a 2 is 72.

72 = 9 x 8.

Therefore, C must be 8 and the original number is 1089. Multiply it by 9 to check the answer:

1089 x 9 = 9,081

Therefore, 1089 is correct.

You might be interested in
Can someone PLEASE AND I MEAN PLEASEEE HELP ME plsss i put brainliest !! pleasee
ra1l [238]

Answer:

Step-by-step explanation:

1) y  = 3x + 1

When x = -1 ,   y = 3*(-1) + 1              

                          = -3 + 1

                        y = -2

(-1 , -2)

When x = 0 ,  y = 3*0 + 1

                      y = 1

(0 , 1)

When x = +1 , y = 3*1 + 1

                          = 3 + 1

                       y = 4

(1 , 4 )

Plot these points in the graph and join the points.

2) y = 2x -1

When x = -1 ,         y = 2*(-1) - 1

                                = - 2 - 1

                             y = -3

(-1 , -3)

When x = 0,      y = 2*0 - 1

                        y = -1

(0 , -1)

When x = +1 , y = 2*1 -1

                         = 2 - 1

                       y = 1

(1 , 1)

7 0
3 years ago
5x+2y=9, and 5x+10y=75,
MatroZZZ [7]

Answer:

x = -1.5 y = 8.25

Step-by-step explanation:

5x + 2y - 5x - 10y = -66

8y = 66

y = 8.25

5x + 2(8.25) = 9

x = -1.5

3 0
3 years ago
Algebra 2 Math question Grade 11
dlinn [17]

Answer: y=-3x+5

Step-by-step explanation:

6x+2y=10

Solve for y

2y=-6x+10

y=-3x+5

5 0
3 years ago
Read 2 more answers
The radii of Earth and Pluto are 6,371 kilometers and 1,161 kilometers, respectively. Approximately how many spheres the size of
antoniya [11.8K]
The volume of a sphere is (4/3) (pi) (radius cubed).

The volume of one sphere divided by the volume of another one is

 (4/3) (pi) (radius-A)³ / (4/3) (pi) (radius-B)³

Divide top and bottom by (4/3) (pi) and you have     (radius-A)³ / (radius-B)³
and that's exactly the same as
                                                         ( radius-A / radius-B )  cubed.

I went through all of that to show you that the ratio of the volumes of two spheres
is the cube of the ratio of their radii.

Earth radius = 6,371 km
Pluto radius = 1,161 km

Ratio of their radii = (6,371 km) / (1,161 km)

Ratio of their volumes =  ( 6,371 / 1,161 ) cubed = about <u>165.2</u>

Note: 
I don't like the language of the question where it asks "How many spheres...".
This seems to be asking how many solid cue balls the size of Pluto could be
packed into a shell the size of the Earth, and that's not a simple solution.
The solution I have here is simply the ratio of volumes ... how many Plutos
can fit into a hollow Earth if the Plutos are melted and poured into the shell.
That's a different question, and a lot easier than dealing with solid cue balls.
4 0
3 years ago
Read 2 more answers
Complete the statements.
miss Akunina [59]
Is there supposed to be a picture I’m sorry I don’t see it
5 0
2 years ago
Read 2 more answers
Other questions:
  • Select the graph of the solution. Click until the correct graph appears. |x| = 2
    12·1 answer
  • What is the GCF of 170 and 210
    9·1 answer
  • Is there anyone that’s good with geometry? If so please help
    15·2 answers
  • The Mt. Aconcagua is 22,834ft tall and Mount Everest is 29,035 feet tall. And he climbed both mountains in two years how many fe
    12·2 answers
  • Write all of the digita that can rwplace each 735&lt;7 ■ 4&lt;761
    6·1 answer
  • A patient is given a 100-milligram dosage of a drug that decays exponentially at a rate of 11% per hour. The doctor wants to kno
    8·1 answer
  • Can someone please help me . Will mark brainliest!
    10·1 answer
  • What is the least possible positive integer-value of n such that sqrt{18\cdot n \cdot 34}$ is an integer?
    11·1 answer
  • ******WORTH 50 POINTS****WILL MARK BRAINLIEST****PLEASE ANSWER ALL QUESTIONS***
    9·1 answer
  • Please helpmeeee<br> .....
    6·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!