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zaharov [31]
3 years ago
10

-4(2n+7)-8n-7 hahdjxuffs

Mathematics
1 answer:
amid [387]3 years ago
6 0
-4(2n + 7) - 8n - 7

First, expand. / Your problem should look like: -8n - 28 - 8n - 7
Second, gather the like terms. / Your problem should look like: (-8n - 8n) - 28 - 7
Third, simplify -8n - 8n to get -16n. / Your problem should look like: -16n - 28 - 7
Fourth, simplify. / Your problem should look like: -16n - 35

Answer: -16n - 35
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How many passwords of 4 digits are there(a)if none of the digits can be repeated?(b)start with 5 and end in an even digit?
liraira [26]

Answer:

5040,56

Step-by-step explanation:

We have to construct pass words of 4 digits

a) None of the digits can be repeated

We have total digits as 0 to 9.

4 digits can be selected form these 10 in 10P4 ways (since order matters in numbers)

No of passwords = 10P4

= 10(9)(8)(7)\\=5040

b) start with 5 and end in even digit

Here we restrain the choices by putting conditions

I digit is compulsorily 5 and hence only one way

Last digit can be any one of 0,2,4,6,8 hence 5 ways

Once first and last selected remaining 2 digits can be selected from remaining 8 digits in 8P2 ways (order counts here)

=56

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sladkih [1.3K]
F - 4 = number of boy cousins.
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fiasKO [112]

Answer:

Step-by-step explanation:

1:9:3

brian gets x

alex gets 9x

colin gets 3x

Brian and colin receive 40

x + 3x = 40

x = 10

alex gets 9x = £90

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The base of a prism has a perimeter of 12 centimeters and a height of 2 centimeters. The area of its base is 5 square centimeter
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Answer:so multiply 12*2=24 and 24*5=120 Is your answer .

Step-by-step explanation:

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