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jeka57 [31]
3 years ago
15

Find the sum of the first 90 terms of the sequence –4, –1, 2, 5, 8, ...

Mathematics
1 answer:
Ray Of Light [21]3 years ago
5 0

Answer:

D. 11655

Step-by-step explanation:

First find the 90th term:

a90=a1+(n−1)d      

 = -4+89(3)=263

Then find the sum:

Sn = n(a1 + an) / 2

S90 = 90 (-4 + 263) /2

S90 = 23,310/2

<u>S90 = 11,655</u>

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