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Aleksandr [31]
3 years ago
9

Assume every 10-digit natural number is a possible telephone number except those that begin with 0, 1 or 2. What fraction of tel

ephone numbers begins with 8 and ends with 8?
Mathematics
1 answer:
lana [24]3 years ago
5 0

Answer: 1/70

Step-by-step explanation:

This is a question that can also be interpreted as what is the probability of having the first number of a phone number to be 8 and the last number of the phone number to also be 8. This answer gives the fraction of the phone numbers that starts with 8 and end with 8.

Since three numbers (0,1,2) cannot start a phone number and we are left to pick from 7 numbers,

then the probability of figure "8" starting phone number = 1/7

Since all 10 numbers can possibly end a phone number,

then the probability of having figure "8" as the last digit of a phone number = 1/10

Hence probability of having "8" as the first and last digit of a phone number = fraction of total telephone numbers that begin with digit 8 and end with digit 8 = 1/7 × 1/10 = 1/70.

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Can some one answer this plz ill give !100 POINTS!
Lorico [155]
Hello!

First of all let's find the perimeter (circumference) of the semi circles. We can combine them to make one circle with a diameter of 4 (as we can see the side length of one semi circle is 4 cm. We now plug it into the circumference equation (\pi=3.14).

4(3.14)=12.56

Now we add up the side lengths of the rectangle.

4+6+4+6=20

Now we add up the length of our circle and rectangle.

20+12.56=32.56

Therefore our answer is 32.56 cm.
----------------------------------------------------------

Now to find the area! If we combine the two semicircles, we get a circle with a diameter of four. This means that is has a radius of two. We use the equation below to find the area of the two circles.

A=\pir²

First we will square our radius.

2(2)=4

Now we multiply by pi.

4(3.14)=12.56

Now we need to find the area of the rectangle.

6(4)=24

Now we add.

24+12.56=36.56.

 
I hope this helps!

8 0
3 years ago
Read 2 more answers
Find the square root of 156.25 by division method
vampirchik [111]
Hello,

I don't know the divison method but is it these one?

156.25= 625/4=(25/2)²

√156.25= 12.5
4 0
3 years ago
How many balls can Michael predict to hit if he is pitched 20 balls?
Vinvika [58]
If Michael is pitched 20 balls he will at least hit ten of them!
7 0
3 years ago
Can someone please explain to me what the "subtraction property of equality" is?
mojhsa [17]
It means that when both sides of an equation have the same number subtracted from them the remaining expressions are equal.                                                                                                                ( ......Hope that I helped you...... )
                                                                                    
6 0
3 years ago
Read 2 more answers
Mr. Yoshi has 75 papers. He graded 60 papers, and he had a student teacher grade the rest. What percent of the papers did each p
Zolol [24]
Make a proportion to find Mr. Yoshi's percentage:
60/75 = x/100

Cross Products:
6000 = 75x
x = 80

So 60/75 = 80/100 which is 80%

Now for the student teacher:
The student teacher graded 75-60 = 15 papers.

Make a proportion:
15/75 = x/100

Cross products:
75x = 1500
x = 20
So 15/75 = 20/100 which is 20%

So Mr. Yoshi: 80%
Student Teacher: 20%

You can check by adding the two scores together and seeing if the sum is 100%:

80% + 20% = 100% 

It is, so the answer is correct.


6 0
3 years ago
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