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3 years ago

I could use a little help with this one. i'm rusty. -3(x+2)-7 = 5x + 7

Mathematics

2 answers:

Pie3 years ago

7 0

Answer:

-3(x+2)-7 = 5x + 7

-3x - 6 - 7 = 5x + 7

-3x - 13 = 5x + 7

-20 = 8x

x = -2.5

Lina20 [59]3 years ago

6 0

Answer:

Exact form = x=-5/2

Decimal form = x=-2.5

Mixed number form = x=-2 1/2

Step-by-step explanation:

Isolate the variable by dividing each side by factors that don't contain the variable.

-3(x+2)-7 = 5x + 7

-3x - 6 - 7 = 5x + 7

-3x - 13 = 5x + 7

-20 = 8x

Divide both sides by 8 to get x by itself

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Ok so the solution which greenrune will (hopefully) correct

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3 years ago

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2 years ago

the second term of a geometric sequence is 18 and the fourth term is 8 find the common ratio . And find the sum of the first 6 t

777dan777 [17]

Answer:

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sum: 73 8/9

Step-by-step explanation:

The general term of a geometric sequence is ...

an = a1·r^(n-1)

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a2 = a1·r^(2-1) = a1·r

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Sn = a1·(r^n -1)/(r -1)

S6 = 27·((2/3)^6 -1)/(2/3 -1)

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The sum of the first 6 terms is 73 8/9.

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<em>Check on the sum</em>

The first 6 terms are ...

27, 18, 12, 8, 5 1/3, 3 5/9

Their sum is 73 8/9, as above.

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3 years ago

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Answer:

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