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Karo-lina-s [1.5K]
3 years ago
12

Evaluate the expression when a=4, b=−5, and c=−8. (−b)+c=

Mathematics
2 answers:
Arlecino [84]3 years ago
8 0
The answer to your question is -35 and always remember pemdas when doing work it helps
pshichka [43]3 years ago
5 0

Answer:

-3

Step-by-step explanation:

( -  - 5) =  + 5 \\  + ( - 8) =  - 8 \\ 5 - 8 =  - 3

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The Great Wall is more than 20,000 kilometers long about 3/4 of it is considered properly preserved
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Answer:

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A researcher is interested in estimating the mean weight of a semi tracker truck to determine the potential load capacity. She t
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Answer:

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Step-by-step explanation:

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What is the sum of a 12-term arithmetic sequence where the last term is 13 and the common difference is -10?
Y_Kistochka [10]
\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=12\\
d=-10\\
a_{12}=13
\end{cases}
\\\\\\
a_{12}=a_1+(12-1)d\implies 13=a_1+(12-1)(-10)
\\\\\\
13=a_1-110\implies \boxed{123=a_1}

\bf \\\\
-------------------------------\\\\
\textit{sum of a finite arithmetic sequence}\\\\
S_n=\cfrac{n}{2}(a_1+a_n)\qquad 
\begin{cases}
n=n^{th}\ term\\
a_1=\textit{first term's value}\\
a_n=\textit{value of the }n^{th}\ term\\
------------\\
n=12\\
a_1=123\\
a_{12}=13
\end{cases}
\\\\\\
S_{12}=\cfrac{12}{2}(a_1+a_{12})\implies S_{12}=\cfrac{12}{2}(123+13)

and surely you know how much that is.
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