3 years ago

Can someone help me with this, I don’t understand.

Mathematics

1 answer:

Tema [17]3 years ago

3 0

180-(83+53)=44
That will be the answer

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The sum of the first n terms of an arithmetic sequence is n/2(4n + 20).

lesantik [10]

Answer:

(a).

$S_{n} = \frac{n}{2} (4n + 20) \\ \\S _{n - 1} = \frac{(n - 1)}{2} (4n - 4 + 20) \\ \\ S _{n - 1} = \frac{(n - 1)}{2} (4n + 16) \\ \\S _{n - 1} = \frac{(n - 1)(4n + 16)}{2} \\ \\ { \boxed{S _{n - 1} = {2 {n}^{2} + 6n - 8}}} \\$

(b).

from general equation:

$S _{n - 1} = \frac{(n - 1)}{2} (4n + 16)$

first term is 4n

common difference:

$16 = \{(n - 1) - 1 \}d \\ 16 = (n - 2)d \\ d = \frac{16}{n - 2}$

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3 years ago

(-3,4) m= -3 how would you solve this problem

nignag [31]

you would do PEMDAS

you do -3 times 4. then you do that and devide by -3.

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3 years ago

The two triangles below are similar. Solve for x:

Nataliya [291]

<u>Answer:</u>

<u>Explanation:</u>

given the two triangles are similar

x = 5(27/9)

x = 135/9

x = 15

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2 years ago

Use the distributive property to factor the expression. 12xy + 28xz

soldier1979 [14.2K]

Answer:

The factored equation would be 4x(3y + 7z)

Step-by-step explanation:

In order to find this, look for the greatest common factor and pull it out. Since both have factors of 4 and both have an x, we pull those out. We then divide each term by 4x to get what is left over.

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2 years ago

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Y = 2/3x - 2<br> y = -x + 3

balandron [24]

the ansewr is x=3 and y=0

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2 years ago