3 years ago

PLEASE PLEASE PLEASE HELP HELP HELP?!?!?!?!?!!?!??!?!?!

Mathematics

1 answer:

nadezda [96]3 years ago

8 0

Answer is A

Step-by-step explanation:

hope that helps

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Step-by-step explanation:

4x - 2(x + 3) = 8

Use distributive property

4x -2x - 6 = 8

2x - 6 = 8

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2x = 14

x = 14 ÷ 2

x = 7

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How many ways can eight letters be arranged into groups of five where order matters and the first two letters are already chosen

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120

Step-by-step explanation:

Since we're dealing with a problem where the order matters and the first two letters are already chosen we need to subtract the number of letters and the number of available slots per group.

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n = 8

k = 5

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$_{n}P_{k}=\dfrac{n!}{(n-k)!}$

$_{6}P_{3}=\dfrac{6!}{6-3)!}$

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The 3*2*1 cancels out and leaves us with:

$_{6}P_{3}=6*5*4$

$_{6}P_{3}=120$

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