Use the cofunction identities to evaluate the expression below without using calculator.
sin220° + sin227° + sin270° + sin263°
A. 1
B. 
C. -1
D. ?0
E. 2
Answer: E
Mathematics
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Simplify.4 - (2 - 2 ? 42)
A. -26 B. -30 C. 34 D. 66
Mathematics
Solve the system. 
y + 
z = 4
x - 
y = 11
x + 
z = 10
A. 
B. 
C. 
D. 
Mathematics
Add or subtract. Assume all variables represent positive real numbers.
+ 
+ 
+ 
A. 
+ 
+ 14
B. 16
+ 
+ 
C. 16
+ 14
D. 160
+ 14
Mathematics
Find the reciprocal.
A. 0
B. 
C. 1
D. 19
Mathematics