HELP ME PLEASEEE!

Change each percent to a decimal or mixed decimal<br>A. 43% B. 2 1/5% C. 13.6% D. 521%

NNADVOKAT [17]

A. 0.43, B. 0.025 C. 0.136 D. 5.21

8 0

2 years ago

Which of the following expressions shows the number of 8 character passwords that can be formed using letters and digits if the

AURORKA [14]

The number of 8 character passwords that can be formed using letters and digits if the password must begin with a letter is 26×31⁷.

<h3>What is Combination?</h3>

The combination helps us to know the number of ways an object can be arranged without a particular manner. A combination is denoted by 'C'.

$^nC_r = \dfrac{n!}{r!(n-r)!}$

where,

n is the number of choices available,

r is the choices to be made.

As it is given that the password can only be made with letters or numbers, and we know that there are only 26 letters and there are 10 numbers, therefore, the total option available is 36.

Also, it is given that the first letter of the password can only be made with letters, therefore, there are only 26 options available for the first place in the password.

The number of 8 character passwords that can be formed using letters and digits if the password must begin with a letter,

$= ^{26}C_{1} \times ^{36}C_{1} \times ^{36}C_{1} \times ^{36}C_{1} \times ^{36}C_{1} \times ^{36}C_{1} \times ^{36}C_{1} \times ^{36}C_{1} \\\\= 26 \times 31\times 31\times 31\times 31\times 31\times 31\times 31\\\\= 26 \times 31^7$

Hence, the number of 8 character passwords that can be formed using letters and digits if the password must begin with a letter is 26×31⁷.

Learn more about Combination:

brainly.com/question/11732255

4 0

1 year ago

there were 2,683 books sold at a bookstore this year. there were 1,317 more books sold last year. how many books were sold last

Nadya [2.5K]

Answer:

4,000

Step-by-step explanation:

you take this years total (2683)

and add how many more there was last year (1317)

then you get 4000!!

hope it helps

4 0

2 years ago

Neeeeeeeed heeeeeeeeelpppp

lora16 [44]

Answer:

A) The cost is the same at 5 months.

Step-by-step explanation:

Lets use m to represent the number of months it will take for the cost to be the same. If we set up an equation, we can write:

75 + 10m = 50 + 15m

-50 on both sides

25 + 10m = 15m

-10m on both sides

25 = 5m

Divide by 5 on both sides.

5 = m

That means it will take 5 months for the costs to be the same.

4 0

2 years ago

Janelle went to the bank twice and withdrew a total of $40 from

Oduvanchick [21]

Answer:

20$ each visit

Step-by-step explanation

Divide 40 by 2 for her 2 visits to the bank

$\frac{40}{2} = 20 \\$

<em>Final Answer: </em> $20$

6 0

1 year ago