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tresset_1 [31]
3 years ago
13

Susan is choosing a 2-letter password from the letters A, B, C, D, and E. The password cannot have the same letter repeated in i

t. How many such passwords are possible?
Mathematics
2 answers:
BlackZzzverrR [31]3 years ago
4 0
Slot method

2 slots possible
1st slot has 5 choices: A,B,C,D,E
2nd has 4 choices since 1 was already chosen for the first slot

so total is 5*4 or 20 diffferent passwords
NikAS [45]3 years ago
3 0

1st letter can be any of 5 letters

 2nd letter can be 5-1 any of 4 letters

 5*4 = 20

there are 20 possible passwords

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lesya [120]

Answer:

RED,ORANGE,YELLOW

PURPLE,YELLOW,GREEN

BLUE,GREEN,YELLOW

PURPLE,BLUE,GREEN

PURPLE,BLUE,RED

PURPLE,ORANGE,BLUE

RED,YELLOW,BLUE,

ORANGE,YELLOW,GREEN

YELLOW,BLUE,PURPLE

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there is many combinations

Step-by-step explanation:

8 0
3 years ago
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Help me please! !!!!!!!
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The answer is c. 1/9. 

If x = -2, y = -1, z = 3

then,    (-2(-1) -(-1)^2) / 3(3)

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1/9

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3 years ago
Help please jggvnhujff
saveliy_v [14]

Answer:

Step-by-step explanation:

<u><em>8).</em></u>  \left \{ {{4x+3y=1} \atop {x+y=2}} \right.

<em>(2)</em> × [ - 3 ]

4x + 3y = 1 ........ <em>(3)</em>

- 3x - 3y = - 6 .... <em>(4)</em>

<em>(3)</em> + <em>(4)</em>

x = - 5

- 5 + y = 2 ⇒ y = 7

<em>( - 5 , 7 )</em>

<u><em>9).</em></u> \left \{ {{-9x+3y=18} \atop {2x+y=-4}} \right.

<em>(1)</em> ÷ [- 3]

3x - y = - 6  ......... <em>(3)</em>

2x + y = - 4 ........ <em>(4)</em>

<em>(3)</em> + <em>(4)</em>

5x = - 10 ⇒ x = - 2

2(- 2) + y = - 4 ⇒ y = 0

<em>(- 2, 0)</em>

<u><em>10).</em></u> \left \{ {{x-2y=14} \atop {10x-6y=0}} \right.

<em>(2)</em> ÷ 10

x - 0.6y = 0 ⇒ x = 0.6y -----> <em>(1)</em>

0.6y - 2y = 14

- 1.4y = 14

y = - 10

x - 2(- 10) = 14 ⇒ x = - 6

<em>(- 6, - 10)</em>

Now is your turn, you can do it!!

3 0
3 years ago
25 divided 5 + 7 - [ 4 x 3 ] =
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The answer is 0, hope it helps lol
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