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Vikentia [17]
3 years ago
5

Write the explicit rule for this arithmetic sequence 9,12,15,18…

Mathematics
1 answer:
MArishka [77]3 years ago
4 0

Answer:

an=9+(n−1)3, an=3n+6

Step-by-step explanation:

Arithmetic Sequence:

d=3

This is the formula of an arithmetic sequence.

an=a1+d(n−1)

Step 1: Substitute in the values of

a1=9 and d=3.

an=9+(3)(n−1)

Step 2: Simplify each term.

an=9+3n−3

Step 3: Subtract 3 from 9.

an=3n+6

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Tom Worker pays $900 annually for $60,000 worth of life insurance
Gelneren [198K]

Answer:

a) = $9000  10yr premiums

b) = $6016.95  Cash value

c) Ratio = 2.017 : 3   =  67%  Ratio Value To Paid Premiums in percent.

Step-by-step explanation:

The life insurance has a 5 year changeable rate after every 5 years.

So we need to find ratio every 5 years to work out what he was paid.

Instead of working out each one

We look for patterns for 60,000

If 5 year = 60,000 this means 2x

But it was 10 years 89/30 =2.9666...rep x (counter-check multiplier)

Back to questions

Tom paid 900 x 10 = 9,000 = ? in value

Answer a = What did he pay = $9000

Answer b = What is this $9000 in cash value where 5 years shows 30,000 the ratio is 9:30 = 3:10 so for 5 years this would = 30% of 30,000 =$9,000 for 5 years.

For 10 years the ratio goes up from 30% of 30,000 to 30,000 of 89,000 = 33.71

To prove 9000 is cash share of 30,000 at 5 years we have to half = $4500 for 5 years.

To prove 9000 is cash share of 89,000 at 10 years we take the $4500 and multiply it by 33.71% = 4500 x 1.3371 = 6016.95

b)  So his cash value = $6016.95

His life insurance = $60,000 as told

c) The ratio = 6016.95 : 9000 simplify = 2.017 : 3  (as we rounded and added + $16.95 as 0.017. for cash value to paid premiums

We  (counter-check multiplier) 2.9666

9000/2.9666 = 3033.77603991

9000- 6016.95 = 2983.05

So we can see after 5 years it decreased by $40

But for b and c, lets say we didnt half it 9000 = 30,000 = 30% 33.71 = 33.71%

We then see 30% of 89000 = 30,000 and x 9000 by 1.33.71 = $12033.90

So cash value will show 10 years = $12,033.90

Showing ratio 9000: 12033.90 =

9000/33.90 =265 = 2.65

So 75% - 2.65% = 3% rounded = 72%

This inverse = 28%

Then the percentage = 67.% can be changed to 28% or used as 72%

4 0
3 years ago
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