gregoryhardrick03 gregoryhardrick03

07-12-2020
Mathematics

contestada

For the series 16, 24, 36, 54... find s7
A)
32.17
B)
115.75
514.75
D)
3906.25

Respuesta :

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16-12-2020

Answer:

C.) 514.75

Step-by-step explanation:

r = 24/16 = 1.5

r = 36/24 = 1.5

r = 54/36 = 1.5

16 + 24 + 36 + 54 + 81 + 121.5 + 182.25 = 514.75

or use:

Sn = a[ (1-r^n) / (1 - r) ]

S7 = 16[ (1 - 1.5^7) / (1 - 1.5) ]

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