The side length of an equilateral triangle is 20 cm. Find the length of the altitude

Mathematics

2 answers:

Effectus [21]3 years ago

7 0

Split in half 20 squared + 10 squared
then find the square root of the answer
10-/5

andreyandreev [35.5K]3 years ago

7 0

Answer:

like it i am a Beiniger please help

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Answer:

carlos will have one brownie left over.

Step-by-step explanation:

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3 years ago

-0.6 + (- 2.5) <br> can someone tell me and explain please the answer.

xenn [34]

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What is the margin of error for a yes/no survey of 200 people with a proportion of 65% who answered \"yes\"?. A. ±3.37%. B. ±5.0

azamat

$\sqrt{(p*q)/n}$

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4 years ago

Jared has a wooden board 11 ft long. He wants to cut it into two pieces so that the longer piece (y) is 4 ft less than 4 times t

patriot [66]

Answer:

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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,

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

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4 years ago