What is the answer to these questions I will give brainly

Mathematics

1 answer:

Natalka [10]2 years ago

6 0

Answer:

1) 12 2) 1/8

Step-by-step explanation:

1) 3 times 4 = 12

2) 1/2 times 1/4 = 1/8

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A) 1.443
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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

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

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

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

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3 years ago

What type of triangle is shown here?

Naddika [18.5K]

Equilateral because all sides are equal

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2 years ago