Add or subtract.(9 - 3i) + (3 + 7i)
A. 6 + 10i
B. -12 - 4i
C. 12 - 4i
D. 12 + 4i
Answer: D
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Find the volume of the described solid.The base of a solid is the region between the curve y = 5cos x and the x-axis from x = 0 to 
. The cross sections perpendicular to the x-axis are squares with bases running from the x-axis to the curve.
A. 
?
B. 6?
C. 
?
D. 
?
Write the equation for the plane.The plane through the point P(3, -2, -5) and normal to n = -4i - 8j + 7k.
A. 3x - 2y + 5z = 7 B. 4x + 8y - 7z = 7 C. -4x - 8y + 7z = -31 D. -3x + 2y - 5z = 7
Which of the following indicates an operational view of the equal sign?
a. Comparing the equal sign to the fulcrum of a balance scale b. Solving a system of equations by using substitution c. Confusing the "-" sign with the "=" sign d. Putting a "5" in the blank for the number sentence 3 + 2 = __ + 7
Simplify the expression.-43
A. -12 B. -64 C. 12 D. 64