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
neonofarm [45]
3 years ago
8

current rules for telephone area codes allow the use of digits 2-9 for the first digit and 0-9 for the second and third digits.

how many different area codes are possible with this rules? That same rule applies to the exchange number. which are the three digits immediately preceding the last four digits of a phone number. Given both of those rules, how many 10- digit phone numbers are possible? given that rules apply to the United States and Canada and a few islands, are there enough possible phone numbers? (assume that the combined population is about 400,000,000.
Mathematics
1 answer:
lukranit [14]3 years ago
5 0
In this question, there are 10 digit phone number which was divided into 3-3-4 digits. Every first digit of the division should be 2-9 which mean only 8 possibilities. The other digits would be 0-9 which mean 10 possibilities. Then the calculation would be:

8*10*10   *    8*10*10    *   8*10*10*10  = 8^3 * 10*7= 512 * 10^7= 5.12 * 10^9

If you convert <span>400,000,000 into the scientific form it will become 4* 10^8. Since 5.12*10^9 > 4 * 10^8, then it is clear that the number should be enough</span>
You might be interested in
Need to finish this today ....
lesya692 [45]
The correct answer is A
3 0
3 years ago
Read 2 more answers
Solve for x: 27 ^ (x + 1) = 9 ^ x​
tekilochka [14]
X = - 3 hope it help
4 0
3 years ago
Read 2 more answers
Calculate (a) the total installment price, (b) the carrying charges, and (c) the number of months needed to save the money at th
Paraphin [41]
8.50 + 11 (24) = 272.50 
The total price 
Carrying charges 72.50 

<span>divide $11 into 200</span>
6 0
3 years ago
Read 2 more answers
HELp mEEEEEEE pLssssssss
EastWind [94]

Answer:

its #3

Step-by-step explanation:

hope this helps

8 0
3 years ago
Read 2 more answers
Help, please! instructions in the picture:
lesya [120]

Answer:

x = 2

Step-by-step explanation:

10/5 = 2 so it would look like this

2 4 6 8 10

1  2 3 4 5

7 0
2 years ago
Read 2 more answers
Other questions:
  • A regional planner employed by a public university is studying the demographics of nine counties in the eastern region of an Atl
    13·1 answer
  • P=2L+2W. Find P if L = 10 and W = 5.
    8·2 answers
  • Draw the image of &lt;EFG after the transformation. identify the type of transformation
    12·1 answer
  • Rewrite 5a-(a-3b) in standard form
    14·1 answer
  • ASAP Please!/True or false? DEF is a right triangle.
    9·2 answers
  • A fish tank has 240 quarts of water. Levi adds another 120 quarts to the tank.
    7·2 answers
  • A taxi charges a flat rate of $3.00, plus an additional $0.50 per mile. Carl will only take the taxi home if the cost is under $
    6·2 answers
  • 12*-11≤ 5*-13I need help on solving a linear iniquities I'm having problems with 12 * -11 ​
    12·2 answers
  • Which of the following is not a function?<br> 3-1<br> 3-2<br> 3-7<br> 7-1<br> 7-2<br> 7-7
    15·1 answer
  • Please dont steal points only real answers
    12·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!