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zalisa [80]
4 years ago
11

Eighty percent of a number.?as a alegrabatic expression.

Mathematics
1 answer:
Andrews [41]4 years ago
6 0

Answer:

\frac{4}{5} x

or

0.8x

Step-by-step explanation:

80\% \: of \: x =  \frac{80}{100}x \\  \frac{80}{100}  x =  \frac{8}{10}x =  \frac{4}{5}  x = 0.8x

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Find a1, for the arithmetic series<br> with S14 = - 420 and d = -6.
faust18 [17]

\bf n^{th}\textit{ term of an arithmetic sequence} \\\\ a_n=a_1+(n-1)d\qquad \begin{cases} a_n=n^{th}\ term\\ n=\textit{term position}\\ a_1=\textit{first term}\\ d=\textit{common difference}\\ \cline{1-1} n = 14\\ d= -6 \end{cases} \\\\\\ a_{14}=a_1+(14-1)(-6)\implies a_{14}=a_1+(13)(-6)\implies a_{14}=a_1-78 \\\\[-0.35em] ~\dotfill

\bf \textit{sum of a finite arithmetic sequence} \\\\ S_n=\cfrac{n(a_1+a_n)}{2}\qquad \begin{cases} a_n=n^{th}\ term\\ n=\textit{last term's}\\ \qquad position\\ a_1=\textit{first term}\\ \cline{1-1} n= 14\\ S_{14}=-420\\ a_{14}=a_1-78 \end{cases}\implies S_{14}=\cfrac{n(a_1+a_{14})}{2} \\\\\\ -420=\cfrac{14[a_1+(a_1-78)]}{2}\implies -420=7(2a_1-78)\implies \cfrac{-420}{7}=2a_1-78 \\\\\\ -60=2a_1-78\implies 18=2a_1\implies \cfrac{18}{2}=a_1\implies 9=a_1

8 0
3 years ago
Select the correct answer.
gulaghasi [49]
The correct answer is B.
7 0
2 years ago
PLEASE HELP ME!!! ILL GIVE BRAINLIEST!!!
Zolol [24]

Answer: A

Step-by-step explanation:

it all refelects over the x=6

7 0
3 years ago
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THIS IS VERY IMPORTANT I WILL GIVE BRAINLIEST TO THE PERSON WHO DOES ALL 4 QUESTIONS FOR ME.
devlian [24]

Answer:

6. 130/130.5

7. C, 14 pink roses and 26 red roses

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Step-by-step explanation:

Number 6 involves two potential answers because although 30% of 435 is 130.5 you cannot have half of a person at a baseball game.

6 0
3 years ago
Show that (A − B) − C is not necessarily equal to A − (B − C).
Leni [432]
(3-2)-1=0

3-(2-1)=2

Boom! Done
7 0
4 years ago
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