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
TiliK225 [7]
2 years ago
10

A seven digit phone number consists of a three-digit prefix followed

Mathematics
1 answer:
Svetlanka [38]2 years ago
4 0

10000 different phone numbers are possible for a  particular prefix if repetion of digits is allowed

5040 different phone numbers are possible for a  particular prefix if repetion of digits is not allowed

<em><u>Solution:</u></em>

Given that,

A seven digit phone number consists of a three-digit prefix followed  by four digits

We have to find the different phone numbers are possible for a  particular prefix

For a paricualr prefix, there are four digits

Total numbers from 0 to 9 are 10

Therefore,

Different ways for phone number for particular prefix:

If repetition is allowed:

Different ways = 10 x 10 x 10 x 10 = 10000 ways

If repetition is not allowed then:

Different ways = 10 x 9 x 8 x 7 = 5040 ways

You might be interested in
Line z has a slope of 2.5 and goes through point (4, 13). Which equation best represents line z?
AnnyKZ [126]

Answer:

y - 13 = (5/2)(x - 4)

Step-by-step explanation:

Here we know the slope and one point on the line.  Use the point-slope formula:

y - k = m(x - h).

Substituting 13 for k, 4 for x and 2.5 for m, we get:

y - 13 = (5/2)(x - 4)

3 0
3 years ago
X-Intercepts?
valkas [14]

Answer:

x-ints:  (2,0) & (4,0)

y-int:  (0,-8)

vertex: (3,1)  *highest point of the graph

line of symmetry: x = 3  *x-value in the middle of x-ints

a value is -#  *if parabola points done it's negative, if it points up it's positive

5 0
2 years ago
The score of golfers for a particular course follows a normal distribution that has a mean of 73 and a standard deviation of 3.
Artemon [7]

Answer:

P(X \geq 74) = 0.3707

Step-by-step explanation:

We are given that the score of golfers for a particular course follows a normal distribution that has a mean of 73 and a standard deviation of 3.

Let X = Score of golfers

So, X ~ N(\mu=73,\sigma^{2}=3^{2})

The z score probability distribution is given by;

           Z = \frac{X-\mu}{\sigma} ~ N(0,1)

where, \mu = population mean = 73

           \sigma = standard deviation = 3

So, the probability that the score of golfer is at least 74 is given by = P(X \geq 74)

 P(X \geq 74) = P( \frac{X-\mu}{\sigma} \geq \frac{74-73}{3} ) = P(Z \geq 0.33) = 1 - P(Z < 0.33)

                                               =  1 - 0.62930 = 0.3707                  

Therefore, the probability that the score of golfer is at least 74 is 0.3707 .

3 0
3 years ago
Find the scale factor using the distance formula.
Julli [10]
1/2 because everything lose half its value points wise.
3 0
2 years ago
Pls help, SHOW WORKINGS/ explain
scoray [572]

Answer:

C. corresponding angles

Step-by-step explanation:

I think this because 1 and 5 are on the same side and they're angles formed by the transversal line that cuts across

6 0
3 years ago
Other questions:
  • PLEASE someone do this math EASY picture attached
    7·2 answers
  • A train traveling 50 mph left a station 30 minutes before a second train running at 55 mph. If 55x represents the distance the f
    8·2 answers
  • Determine the 20th term of the sequence 1,4,7,...
    7·2 answers
  • Please help ggghhhhhhhhhhhgghhhugugugh
    8·1 answer
  • Which of the following are square roots of the number below? Check all that
    10·1 answer
  • benjamin rode his bicycle 3.6 miles on saturday and 4.85 miles on sunday how many miles did he ride saturday and sunday combined
    8·2 answers
  • Help 100 Points + brainlest math
    9·2 answers
  • Find the equation of a line that passes through these two points
    13·2 answers
  • My car gets 23 miles per gallon at 60 miles per hour. Is the number of miles I can drive at 60 miles per hour a linear function
    6·1 answer
  • What is the value of x?<br><br> Thank you!
    7·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!