Identify the independent and dependent variables.z = 
A. independent: z, x, and y, dependent: 4
B. independent: z, dependent: x and y
C. independent: x and y, dependent: z
D. independent: 4, dependent: z, x, and y
Answer: C
Mathematics
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Sketch the surface z = f(x,y).f(x, y) = 3 - x2
A. 
B. 
C. 
D. 
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Multiply. Write the result in the form a + bi.
? 
A. -15 B. 15i2 C. -15i D. 15
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Use a calculator to find the function value to four decimal places.cos (2.28)
A. 0.7589 B. 1.3177 C. 0.9992 D. -0.6512
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Find the sum if it exists.
A. 
B. 
C. 
D. 
Mathematics