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
The table of values below represents a linear function and shows the weight of a kitten as it has grown. What is the output for
Kipish [7]
The answer is a because casts
3 0
3 years ago
What is the fraction twelve twentieths in its simplest form
Alla [95]
You mean \frac{12}{20} or \frac{20}{12} ?

If you had meant, \frac{12}{20}, then the simplest form of this fraction would be - \frac{3}{5}

Divide both parts of the fraction by 4, and you get \frac{3}{5}the simplest form of the fraction.
Finding out the simplest form of a given fraction is nothing else than cancelation.

Flop it, you have with you - \frac{20}{12}
Flop the simplest form of the previous fraction, that's \frac{5}{3}

If you had meant \frac{20}{12}, then this will certainly be of any use to you.

HOW TO UNDERSTAND THAT THE FRACTION IS IN ITS SIMPLEST FORM?
Maybe, you are just simplifying and simplifying...but you don't even know when to stop. You can understand whether a fraction is in its simplest form or not by seeing that the numerator and the denominator have a common factor to divide it by, or not.

For instance, consider the case here - \frac{3}{5} or \frac{5}{3}<span>. We can't divide it any further. So, we know that it is in its simplest form.
</span>
L O N G Process:
Well, if you want to divide it by the smallest common factor to its larger, then --
\frac{12}{20} or \frac{20}{12}

1) 
Divided by 2 = \frac{6}{10} or \frac{10}{6}

2) 
Next, also by 2 = \frac{3}{5} or \frac{5}{3}

That took much longer, right.
<span> So, it is more preferable to divide the fraction by the possible largest common factor, you can guess of.</span>

3 0
3 years ago
Read 2 more answers
7. Kayla has set aside $105 to spend on books and CDs. Each book b cost $5 and each CD c costs $12. Which inequality could be us
laila [671]

5b+12c=105    She can buy 21 Books or 8 CDs and 1 book or a variation of both.

5 0
4 years ago
Please help<br> May need to zoom in
Soloha48 [4]

Answer:

7%=0.07, 25%=0.25, 6.5%=0.065, 5%=1/20, 15%=3/20

Step-by-step explanation:

Feel free to ask questions if you don't know how to find the answer

8 0
3 years ago
Read 2 more answers
Explain how to use the combine place vaule strategy to find 223- 119
mr Goodwill [35]
   223
  -119
----------

Subtract 9 from 3.  To do this, you must borrow:

The first digit of the answer is thus 13-9=4.

Next, you must subtract 1 from 1, obtaining 0.

Lst, you must subtract 1 from 2, obtaining 1.

Putting all of these results together:    1 0 4, or 104.

Check:  Does   104 + 119 = 223?


    1
  104
 +119
-------
   223

yes.
4 0
3 years ago
Other questions:
  • Write 0.375as an unreduced fraction the use words to name the number
    8·1 answer
  • Jack wants to buy a Ford F150 Supercab with a base MSRP of $28,882.00. He wants the V8 Engine for an extra $1,379.00 and 4wd for
    11·1 answer
  • Y=150+55x in slope intercept form?
    12·1 answer
  • Find an equation of a parabola with a vertex at the origin and directrix y = –2.5
    8·2 answers
  • Evaluate 2(10 - d) + f, when d = 7 and f = -3.
    15·2 answers
  • write the standard form of the equation of the circle that passes through the origin, (2.8,0), and (5,2)
    8·1 answer
  • Rationalise the denominator and simplify 6/√3​
    13·1 answer
  • It is important that face masks used by firefighters be able to withstand high temperatures because firefighters commonly work i
    8·1 answer
  • Which letter has line symmetry?
    10·2 answers
  • Kelly recorded the following data while observing the temperature, in degrees Fahrenheit, of a chemical liquid cooling in her sc
    8·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!