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3 years ago

What is the answer to 6n+8m-3n

Mathematics

2 answers:

Alex_Xolod [135]3 years ago

6 0

Answer:

I believe the answer to this question is: 8m+3n

olchik [2.2K]3 years ago

4 0

6n+8m-3n
Collect like terms
3n+8m is the real one u looking for

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Nadya [2.5K]

Answer:

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3 years ago

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Calculate the arithmetic sequence in which a9=17 and the common difference is d=-2.1

jek_recluse [69]

Answer:

$S_{31}=71.3$

Step-by-step explanation:

The nth term of an arithmetic sequence is given by the formula,

$U_n=a_1+(n-1)d$

We were given that the 9th term is $17$ .

$\Rightarrow 17=a_1+(9-1)(-2.1)$

$\Rightarrow 17=a_1+(8)\times(-2.1)$

$\Rightarrow 17=a_1-\frac{84}{5}$

$\Rightarrow 17+\frac{84}{5}=a_1$

$\Rightarrow a_1=\frac{169}{5}$

The sum of the first n-terms is given by the formula,

$S_n=\frac{n}{2}(2a_1+(n-1)d)$

To find $S_{31}$ , we substitute $n=31$ , $a_1=\frac{169}{5}$ and $d=-2.1$ .

$\Rightarrow S_{31}=\frac{31}{2}(2(\frac{169}{5}+(31-1)(-2.1))$

$\Rightarrow S_{31}=\frac{31}{2}(2(\frac{169}{5}+(30)(-2.1))$

$\Rightarrow S_{31}=\frac{31}{2}(\frac{23}{5})$

$\Rightarrow S_{31}=\frac{713}{10}$

$\Rightarrow S_{31}=71.3$

The correct answer is D

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4 years ago

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Help me I'm giving 20 points <br><br>a²•b⁶ if a =½ and b=2 ?

exis [7]

Answer:

try 0.5

Step-by-step explanation:

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3 years ago

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Answer:

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2 years ago

How to solve d - 5 = 7 algebraically

adelina 88 [10]

Answer:

d = 12

Step-by-step explanation:

d - 5= 7

( d - 5 ) + 5 = 7 + 5

d - 5 + 5 = 12

d = 12

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3 years ago

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