Solve the system by the addition method. Be sure to check all proposed solutions.x + y = 4x - y = -12
A. {(-4, 8)}
B. {(4, 9)}
C. {(-5, 9)}
D. ?
Answer: A
Mathematics
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Use an identity to write the expression as a single trigonometric function or as a single number.2 cos2 75° - 1
A. - 
B. - 
C. 
D. 
Mathematics
Find the reference angle for the given angle.395°
A. 145° B. 125° C. 35° D. 55°
Mathematics
Indicate whether the equation illustrates the multiplication property of 0, the multiplicative identity, the commutative property of multiplication, or the associative property of multiplication.
? 0 = 0
A. Associative property of multiplication B. Multiplicative identity C. Commutative property of multiplication D. Multiplicative property of 0
Mathematics
Draw the appropriate figure indicating a volume that is found from the integral.
A. 
B. 
C. 
D. 
Mathematics