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3 years ago

14

Please help the answer i put idk if its correct (brianlest if correct)

1 answer:

mojhsa [17]3 years ago

6 0

Answer:

9,5

Step-by-step explanation:

It's it reflection on the opposite side, so you get (9,5) as they were also given to you.

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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

8 0

3 years ago

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A crew of highway workers paved 2/15 miles in 20 minutes if they work at the same rate what portion of a mile will they pave in

FromTheMoon [43]

<span>The workers paved 2/5 miles in 1 hour =)</span>

4 0

2 years ago

Should be 2/5 I'm doing the test rn

xz_007 [3.2K]

whats the question you are just saying the answer

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2 years ago

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Natalie walked 35 mile in 12 hour. How fast did she walk, in miles per hour? A. 310 mile per hour B. 56 mile per hour C. 115 mil

Paha777 [63]

12 hours = 35 miles
1 hour = 35 / 12
= 2.91666667 miles
= 2 miles per hour.

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3 years ago

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Is this function linear, quadratic, or exponential?<br>

vladimir1956 [14]

Answer:

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2 years ago

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