3 years ago

Find the sum of the arithmetic series given ai = 45, an = 85, and n = 5.

Mathematics

1 answer:

seraphim [82]3 years ago

5 0

Answer:

C. 325.

Step-by-step explanation:

The last term a5 = 85

a1 = 45

Sum of n terms = n/2 (a1 + l)

So here we have n = 5, a1 = 45 and the last term l = 85

= (5/2)(45 + 85)

= 5/2 * 130

= 325.

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