Asaltyskid
Asaltyskid Asaltyskid
  • 01-08-2016
  • Mathematics
contestada

Please help out
Write the explicit formula for the geometric sequence.

a1 = -5 a2 = 20 a3 = -80




A. an = -5 • (-4)n



B. an = -5(-4)n-1



C. an = -4(-5)n-1



D. an = -5 • (4)n

Respuesta :

dalendrk
dalendrk dalendrk
  • 01-08-2016
[tex]a_1=-5;\ a_2=20;\ a_3=-80\\\\a_n=a_1r^{n-1}\\\\r=a_2:a_1\to r=20:(-5)=-4\\\\Answer:\boxed{a_n=-5\cdot(-4)^{n-1}}\to\fbox{B.} [/tex]
Answer Link

Otras preguntas

if 90 is 80% of a value, what is that value
Light takes approximately one second to travel from the earth to the moon this means that the moon is approximately
Help pls!!! Describe two ways to reduce air pollution and slow climate change.
If the velocity of a moving object doubles, what happens to its momentum?
Of 50 people, 38 have brown hair, 29 have brown eyes, and 23 have both brown hair and brown eyes. how many have neither brown hair nor brown eyes? A) 6 C) 10
The logic of the colonizer described in this Nigerian poem reflects their?
Find an angle between 0° and 360° that is coterminal with ?284° .
What was the Royal Society in England founded to support
Factor the expression below. 49a2 – 25b2 Which of the following binomials is a factor of the expression?
What is the impact of crime in community