Can someone please help, im legit confused.

Mathematics

1 answer:

AlladinOne [14]3 years ago

4 0

Answer:

Probably 7.

Step-by-step explanation:

You may be asking yourself, "Why 7?". That's all.

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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

2 more than 5 groups of 3

Anvisha [2.4K]

5*3+2 = 15+2 = 17
The asnwer is 17.

5 0

4 years ago

Yo can someone help please

Mama L [17]

Answer: 5/3

One of the side lengths goes from 3 to 5. So, the scale factor is 5/3.

Hope that helped!

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3 years ago

Write five equivalent expressions that are equivalent to:<br> 120 + 3.6

MAVERICK [17]

Answer:

*61.8 × 2

*10.6 + 113

*247.2 divided by 2

*203.6 - 80

*111.6 + 12

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3 years ago

Find the mean and median of the data set. 3, 5, 6, 2, 10, 9, 7, 5, 11, 6, 4, 2, 5, 4

ivann1987 [24]

Answer:

Mean: 5.6428571428571

Median: 5

Step-by-step explanation:

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3 years ago