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samiiegarciia
11.04.2020 •
Mathematics
A cell phone company plans to market a new smartphone. they have already sold 612 units durning the first week of the campaign. they plan to increase sales by 8% each week. for example, they plan to sell about 661 units durning week 2. they want to continue this for a year (52 weeks)
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Ответ:
The first term is 612.
The common ratio is 1.08 and
The recursive rule is![a_{n} = a^{n-1} \times r](/tpl/images/0595/0959/975e1.png)
Step-by-step explanation:
the question to the problem is to write the values of the first term, common ratio, and expression for the recursive rule.
The first term :
In geometric sequence, the first term is given as
.
⇒![a_{1} = 612](/tpl/images/0595/0959/c1785.png)
Now, the geometric sequence follows as 612, 661, ........
The common ratio (r) :
It is the ratio between two consecutive numbers in the sequence.
Therefore, to determine the common ratio, you just divide the number from the number preceding it in the sequence.
⇒ r = 661 divided by 612
⇒ r = 1.08
To find the recursive rule :
A geometric series is of the form a,ar,ar2,ar3,ar4,ar5........
Here, first term
and other terms are obtained by multiplying by r.
Observe that each term is r times the previous term.Hence to get nth term we multiply (n−1)th term by r .The recursive rule is of the form![a_{n} = a^{n-1} \times r](/tpl/images/0595/0959/975e1.png)
This is called recursive formula for geometric sequence.
We know that r = 1.08 and
= 612.
To find the second term
, use the recursive rule ![a_{n} = a^{n-1} \times r](/tpl/images/0595/0959/975e1.png)
⇒![a_{2} = a^{2-1}\times r](/tpl/images/0595/0959/63fba.png)
⇒![a_{2} = a^{1}\times r](/tpl/images/0595/0959/a8e6b.png)
⇒![a_{2} = 612\times 1.08](/tpl/images/0595/0959/03ee2.png)
⇒![a_{2} = 661](/tpl/images/0595/0959/d11a8.png)
Ответ:
241 clients
Step-by-step explanation:
His problem can be solved using the principle of proportionality or rule three.
We can take advantage of the proportion between respondents who tell us the number of respondents and how many expect to go on vacation and the total number of workers, therefore:
Respondents /// Whole company
Vacations 21 x
Total 45 516
then x equals:
x = (516 * 21) / (45)
x = 240.8
x = 241 clients
This means that approximately 241 clients expect to go on vacation throughout the company.