Find the exact value by using a sum or difference identity.cos 285°
A. - 
B. 
C. -
(
+ 1)
D. -
(
- 1)
Answer: B
Mathematics
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Find a formula for the nth partial sum of the series and use it to find the series' sum if the series converges.7 + 
+ 
+ ... + 
+ ...
A. 
; 
B. 
; 
C. 
; 
D. 
; 
Mathematics
Determine whether the diagram could represent a function.
A. Yes B. No
Mathematics
Complete the square in x and y to find a Cartesian equation of the form 
+ 
= 1 for the given equation. Identify the center. 2x2 + 5y2 - 28x + 40y + 168 = 0
A. 
+ 
= 1; Center: (-7, 4)
B. 
+ 
= 1; Center: (7, -4)
C. 
+ 
= 1; Center: (7, -4)
D. 
+ 
= 1; Center: (-7, 4)
Mathematics
Multiply. Simplify if possible.
? 
A. - 
B. 
C. - 
D. - 
Mathematics