Decompose the terms in the sum as

so there are 20 terms in the sum. Then our sum simplifies to

Now, if

we can reverse the order of terms to get the same sum,

so that doubling up the sum gives

So, our sum evaluates to

Answer:its not
D, C,or A
Step-by-step explanation:SORRY IF IM NOT RIGHT!!! MARK ME BRAINLIEST
Answer:
162 inches
Explanation:
A yard is 36 inches. So just multiply 4.5 by 36
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PS:
Can I have Brainliest?
0.55^2 + cos^2 = 1
cos^2 = 1 - 0.55^2
cos^2 = 1 - 0.3025
cos^2 = 0.6975
cos = 0.8351