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Mice21 [21]
3 years ago
7

What are the explicit equation and domain for an arithmetic sequence with a first term of 5 and a second term of 3?

Mathematics
2 answers:
meriva3 years ago
3 0
Any arithmetic sequence can be expressed as:

a(n)=a+d(n-1), a=initial term, d=common difference, n=term number

In this case a=5, and d=-2 so

a(n)=5-2(n-1)  which can be simplified...

a(n)=5-2n+2

a(n)=7-2n

The domain is restricted to integers from 1 to +oo.
sveticcg [70]3 years ago
3 0

Answer:

  1. a_n=7-2n
  2. All positive integers greater than 1 will be its domain.

Step-by-step explanation:

The explicit equation for an arithmetic sequence is,

a_n=a_1+(n-1)d

Where,

a_n = nth term in the arithmetic sequence,

a_1 = 1st term in the arithmetic sequence,

d = common difference.

Here, the first term of 5 and a second term of 3. So the common difference is -2.

Putting the values,

a_n=5+(n-1)(-2)=5+2-2n

i.e a_n=7-2n

As n neither be negative nor fraction, because it is the number of term, so all positive integers greater than 1 will be its domain.

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notka56 [123]

The exact value of cos120 if the measure 120 degrees intersects the unit circle at point (-1/2,√3/2) is 0.5

<h3>Solving trigonometry identity</h3>

If an angle of measure 120 degrees intersects the unit circle at point (-1/2,√3/2), the measure of cos(120) can be expressed as;

Cos120 = cos(90 + 30)

Using the cosine rule of addition

cos(90 + 30) = cos90cos30 - sin90sin30

cos(90 + 30) = 0(√3/2) - 1(0.5)

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find a positive angle less than one revolution around the unit circle that is co-terminal with the given angle -15pi/17
natta225 [31]
ANSWER
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EXPLANATION

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