Solve the system.
A. x = 2, y = -7, z = -1
B. x = 2, y = -7, z = 1
C. x = 2, y = 7, z = 1
D. x = 2, y = 7, z = -1
Answer: A
Mathematics
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Provide an appropriate answer.Find 
when u = 0 and v = 
if z(x, y) = sin x + cos y, x = u ? v, and y = u + v.
A. 
= 2
B. 
= 1
C. 
= -1
D. 
= 0
Mathematics
Answer the given question by setting up and solving the appropriate proportion. If necessary, round the answer to two decimal places.By weight, the ratio of chlorine to sodium in table salt is 35.46 to 23.00. How much sodium is contained in 84.00 g of salt?
A. 129.51 g B. 50.95 g C. 54.48 g D. 33.05 g
Mathematics
Multiply.× 
A. 21.11 B. 35.6 C. 22.1 D. 21
Mathematics
Solve by completing the square.x2 = 7 - 8x
A. -4 ± 
B. -4 ± 2
C. 4 + 
D. -1 ± 
Mathematics