Answer:
2
Step-by-step explanation:
18-4^2=2
You forgot picture.So I can't explain that
The answer is 40 square root of 6.
To determine the sum of the arithmetic series, simply remember that i is the pattern that you are going by which is 1,2,3.
The top value on the sigma sign tells you the final value that you must go to.
So use the equation to go from 1 to 18. So it would be 2(1) + 9 + 2(2) + 9 etc.
