I will give brainliest and 30 points

Mathematics

2 answers:

Oksi-84 [34.3K]3 years ago

8 0

Answer: 15

Step-by-step explanation:

Ierofanga [76]3 years ago

6 0

Answer:

it is answer d u just took the test i hope its right

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anzhelika [568]

The answer is D as said above

8 0

3 years ago

Find d for the arithmetic series with S17=-170 and a1=2

Irina18 [472]

So, we know the sum of the first 17 terms is -170, thus S₁₇ = -170, and we also know the first term is 2, well

$\bf \textit{ sum of a finite arithmetic sequence}\\\\
S_n=\cfrac{n(a_1+a_n)}{2}\qquad 
\begin{cases}
n=n^{th}\ term\\
a_1=\textit{first term's value}\\
----------\\
n=17\\
S_{17}=-170\\
a_1=2
\end{cases}
\\\\\\
-170=\cfrac{17(2+a_{17})}{2}\implies \cfrac{-170}{17}=\cfrac{(2+a_{17})}{2}
\\\\\\
-10=\cfrac{(2+a_{17})}{2}\implies -20=2+a_{17}\implies -22=a_{17}$

well, since the 17th term is that much, let's check what "d" is then anyway,

$\bf n^{th}\textit{ term of an arithmetic sequence}\\\\
a_n=a_1+(n-1)d\qquad 
\begin{cases}
n=n^{th}\ term\\
a_1=\textit{first term's value}\\
d=\textit{common difference}\\
----------\\
n=17\\
a_{17}=-22\\
a_1=2
\end{cases}
\\\\\\
-22=2+(17-1)d\implies -22=2+16d\implies -24=16d
\\\\\\
\cfrac{-24}{16}=d\implies -\cfrac{3}{2}=d$

6 0

3 years ago

Determine whether the cost for ordering multiple items that will be delivered is sometimes, always or never proportional. Explai

Tanzania [10]

It could sometimes be proportional. The reasoning here is that if all the items have different prices it won't be, however if the items you are ordering all have the same price they will be!

5 0

3 years ago

5(x-4)=15<br> find out what x is

Digiron [165]

Answer:

Step-by-step explanation:

7-4=3

5×3=15

plz mark brainliest

4 0

2 years ago

Read 2 more answers

3/4 divided by N = 6/5<br> What are the remaining fact family number sentences?

Mice21 [21]

Answer:

5/8 or 0.625

Step-by-step explanation:

If you have a question somewhat like this use math way

7 0

2 years ago