Question

What is the sum of an 11–term arithmetic sequence where the first term is 5 and the last term is 55?
Answer







360








390








300








330

Answer 1

the sum of an arithmetic series can be found by using the formula

\[s _{n}= \frac{n}{2}[a + l]\]

where n = number of terms, a = 1st term and l = last term

in your question n = 11 a = 5 and l = 55

substitute and evaluate to find the answer

Answer 2

390

Answer 3

no 330

Answer 4

its 330

Answer 5

yes

Answer 6

yyaaya