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marishachu [46]
3 years ago
5

What is the sum of the geometric sequence -3, 18, -108, ... if there are 8 terms

Mathematics
1 answer:
creativ13 [48]3 years ago
6 0

Answer:

Step-by-step explanation:

common ratio=18/-3=-108/18=-6, a=-3

sn=a(r^n-1)(r-1)

sn=-3((-6)^n-1)(-6-1)

sn=-3(-6)^8-1)/(-7)

s8=-3(1679615)/(-7)

s8=719836

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In 1 year, 120 students passed GCSE maths. The following year 98 passed. Find the percentage decrease in the pass rate. PLEASE P
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Answer:

y = 10/9x + 9

Step-by-step explanation:

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Check pdf

Step-by-step explanation:

Download pdf
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