22longgabriel
22longgabriel 22longgabriel
  • 19-04-2020
  • Mathematics
contestada

PreCalc help with sums. I will mark brainliest. (also can you explain WHY you got what answer you got? Thanks)

PreCalc help with sums I will mark brainliest also can you explain WHY you got what answer you got Thanks class=
PreCalc help with sums I will mark brainliest also can you explain WHY you got what answer you got Thanks class=

Respuesta :

amna04352
amna04352 amna04352
  • 19-04-2020

Answer:

1) first two (A & B)

2. -1,533

Step-by-step explanation:

Sum to infinity is finite when

-1 < r < 1

Option 1: r = -¼

Option 2: r = 27/81 = ⅓

Option 3: r = 3/2

Option 4: r = 17.75/7.1 = 2.5

a = -3

r = -6/-3 = 2

S9 = -3 × (2⁹ - 1)/(2 - 1)

= -1533

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