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gtnhenbr [62]
2 years ago
9

Math question down below

Mathematics
1 answer:
sergiy2304 [10]2 years ago
6 0
I think the answer is 17.5 years

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a cell phone company plans to market a new smartphone. they have already sold 612 units durning the first week of the campaign.
Vadim26 [7]

The first term is 612.

The common ratio is 1.08 and

The recursive rule is a_{n} = a^{n-1} \times r

<u>Step-by-step explanation:</u>

the question to the problem is to write the values of the first term, common ratio, and expression for the recursive rule.

<u>The first term :</u>

In geometric sequence, the first term is given as a_{1}.

⇒ a_{1} = 612

Now, the geometric sequence follows as 612, 661, ........

<u>The common ratio (r) :</u>

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

<u>To find the recursive rule :</u>

A geometric series is of the form  a,ar,ar2,ar3,ar4,ar5........

Here, first term a_{1} = a 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

This is called recursive formula for geometric sequence.

We know that r = 1.08 and a_{1} = 612.

To find the second term a_{2}, use the recursive rule a_{n} = a^{n-1} \times r

⇒ a_{2} = a^{2-1}\times r

⇒ a_{2} = a^{1}\times r

⇒ a_{2} = 612\times 1.08

⇒ a_{2} = 661

3 0
3 years ago
Find the equation of the line that passes through (5, -1) and<br> (-10, -10)
SashulF [63]

Answer:

y = 0.6x – 4  

or

y =   3/5x -4

Step-by-step explanation:

3 0
3 years ago
What is 20% of 55?<br> I need help PLEASE!
Assoli18 [71]
20% of 55 is 11

Convert your percentage into a decimal: 
\frac{20}{100} = 0.2

Multiply your decimal by 55:
0.2 \times 55 = 11
8 0
2 years ago
Read 2 more answers
Can someone help me with this
n200080 [17]

Answer:

Step-by-step explanation:

for dot plot A, the mean is 90 to the medium becuase it has the most dots out of them all.

8 0
2 years ago
Which of the following expressions are equivalent? Justify your reasoning.. . a.4√x3. . 1. x−1. . b.10√x5•x4•x2. . c.x. 1. 3. •x
sladkih [1.3K]
A ) \sqrt[4]{ x^{3} } = x^{3/4}
B ) \frac{1}{ x^{-1} } = x
C ) \sqrt[10]{ x^{5} * x^{4}* x^{2}  } = \sqrt[10]{ x^{11} }= x^{11/10}
D ) x^{1/3} * x^{1/3} * x^{1/3} = x
Therefore: B = D
7 0
3 years ago
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