Answer:
√306
Step-by-step explanation:
→ Work out the height of the triangle
14 - 5 = 9
→ Use Pythagoras theorem
√15² + 9²
→ Simplify
√306
Simplify 
to 
Both are over 11, so, just sum.
An = A1 + (N-1)d
A1 is the first term (in this case 2)
d is the common difference (what is the difference between all consecutive even numbers? 2)
N is the number of terms to find (in this case 29)
An = 2 + (29-1)2 = 58
I would say none of the above, unless you typed it wrong. The sum is the product of the number of terms minus one and two, plus two more. So it's almost answer B but not really. Good luck with this one.
Answer:
c
Step-by-step explanation:
the other guy is bad
