First we multiply 2r*r and it gives us 
.
Then -5r, + 20r = 15r
Then -5*10 gives us -50.
So the answer is:
Then -5r, + 20r = 15r
Then -5*10 gives us -50.
So the answer is:
X 2 +6x+___ complete the square
1 answer:
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Answer:
425.25
Step-by-step explanation:
Since we are given 36th term as 14 and we know common difference is , it means that from the first term, we add
to each and get 14 on the 36th term. To figure out the first term, thus, we have to subtract
35 times from 14. Let's do it to get first term:
The sum of arithmetic sequence formula is:
Where,
is the sum of nth term (we want to figure this out for first 36 terms)
is the first term (we figured this out to be 9.625)
is the term number (36 for our case)
is the common difference (given as
)
Substituting all the values, we get:
First answer choice is right.