The answer is 15.9 because 3.9+111=15.9
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cos ( x + pi/2) =cos(x)cos(pi/2)-sin(x) sin(pi/2)
= cos(x)×0-sin(x) ×1
cos ( x + pi/2) = - sin(x)
Answer: you can change the subject so that you can help people with other subjects
Step-by-step explanation:
Answer:
The original number of oranges purchased is 260
Step-by-step explanation:
Let the original number of oranges purchased be x
We are given that The number of oranges a grocery store bought this year was 15% more than the number of oranges bought last year.
So, Oranges bought this year = 
We are given that This year the store bought 299 oranges.
So, 

x=260
Hence the original number of oranges purchased is 260
Answer:
-7 is the pattern in the sequence. In other words, we subtract 7 from the numbers.
Step-by-step explanation:
31 - 7= 24
24 - 7= 17
17 - 7= 10
We subtract 7 from 31 to get 24. We subtract 7 from 24 to get 17. We subtract 7 from 17 to get 10.