3 years ago

How many 4-digit numbers are possible if the hundreds digit is 8 and if repetition of digits is allowed?

1 answer:

7 0

There are 10 digits from 0 to 9
When you say 4 digit number that means it can't start with zero, then
1) there are 9 ways to chose the 1st digit (excluding zero)
2) there are only 1 ways to chose the 2nd digit (only 8))
3) there are 10 ways to chose the 3rd digit
4) there are 10 ways to chose the 4th digit

TOTAL NUMBER OF WAYS: 9 x 1 x 10 x 10 = 900

You might be interested in

Can you help me I dont understand

Tcecarenko [31]

What don’t you understand?

6 0

2 years ago

The image below is a triangle drawn inside a circle with center O:Which of the following expressions shows the area, in square i

zaharov [31]

The Area of a circle =π.R² (R=radius). & π 3.14

Since you didn't give the length of the Radius, then the area of the circle=3.14R²

5 0

3 years ago

Hey can someone help me with this problem?

Sindrei [870]

(f - g(x) = 2x -2x squared

(sorry didn't know how to do the squared sign )

6 0

2 years ago

I screenshotted my question.

andrey2020 [161]

Answer:

Step-by-step explanation:

Hello,

$4-4x\leq 24\\\\\text{We can divide by 4.}\\\\1-x\leq 6\\\\\text{We can add x.}\\\\1\leq x+6\\\\\text{We can subtract 6.}\\\\1-6=-5\leq x \large \boxed{\sf \bf x \in [-5;+\infty[}$

Thanks

3 0

2 years ago

Read 2 more answers

When three times the sum of a number and seven is increased by ten, the result is four. What is the number ?

densk [106]

Answer:

x=9 :))

Step-by-step explanation:

First set up your equation.

"3 times" is multiplication

"THE SUM of A NUMBER and seven" that is parenthesis because of the multiplication before it

"is increased by ten" that is an addition at the end

Now we have 3(x+7)+10=4

Solve your equation!

Distribute the 3 now we have 3x+21+10=4

Add like terms

now it should look like this... 3x+31=4

Subtract 31 from both sides and it looks like...

3x=27

Divide by the x-value

x=9

4 0

3 years ago