Evaluate the polynomial.-2x2 - y2 + xy for x = -2 and y = 3
A. 11
B. -5
C. -11
D. -23
Answer: D
Mathematics
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Match the equation with the surface it defines.
+ 
= 
A. Figure 1 B. Figure 4 C. Figure 2 D. Figure 3
Mathematics
Solve the problem.A bridge with a semi-elliptical arch extends over a river as shown. Find an equation of the ellipse that represents the arch of the bridge.
A. 
+ 
= 1
B. 
+ 
= 1
C. 
+ 
= 1
D. 
+ 
= 1
Mathematics
Write the expression with positive exponents. Then simplify if possible.(-2)-4
A. - 
B. -16
C. 16
D. 
Mathematics
Perform the indicated operations and write the result in standard form.(5 + 6i)(2 - i) - (1 - i)(1 + i)
A. 16 + 7i B. 14 + 7i C. 14 + 17i D. 18 + 7i
Mathematics