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

Your friend is asked to differentiate between evaporation and boiling.what questions could you ask to make him to know the difference between evaporation and bo
what do I do to figure out this problem:3x+8=26+x
Liz wants to drink 1.5 litres of water each day. She buys the water in packs of 6 bottles. Each bottle contains 0.5 litres of water. How many packs of water do
name a metal that doesn't conduct electricity
explain in steps how to graph this linear inequality 2x+3y > -2
What's the word for to talk on and on pointlessly, without clear direction
Which expression is equivalent to 27/125
If 2/5 of a number is added to 1/3 of the same number ,the sum is 22. What is the number?
name a metal that doesn't conduct electricity
explain why the motion of a body which is moving with constant speed in a circular path is said to be accelerated ?