pinkrose1213
pinkrose1213 pinkrose1213
  • 19-06-2017
  • Mathematics
contestada

calculate the 5th term of the sequence which has this explicit formula: an=3/2n(2n+5), n=1,2,...

A. 63/64
B. 39/8
C. 17/4
D. 9/2

Respuesta :

KrystaCort KrystaCort
  • 12-09-2019

Answer:

D. 9 ÷ 2

Step-by-step explanation:

For getting the nth value of the sequence we simply put the value of n in a formula.

In the given sequence for finding the 5th term we simply put n = 5 in given explicit formula:

We have [tex]a_{n} = \frac{3}{2n}(2n+5)[/tex]

Putting n = 5

[tex]a_{5} = \frac{3}{2\times5}(2\times5+5)[/tex]

⇒ [tex]a_{5} = \frac{3}{10}(15)[/tex]

⇒ [tex]a_{5} = \frac{9}{2}[/tex]

Thus, option (D) is correct.

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