Let A and B be sets with cardinal numbers, n(A) = a and n(B) = b, respectively. Decide whether the statement is true or false.n(A ? B) = n(A) + n(B) - n(A ? B)

A. True
B. False


Answer: A

Mathematics

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Find the volume of the described solid.The solid lies between planes perpendicular to the x-axis at x = -2 and x = 2. The cross sections perpendicular to the x-axis are circles whose diameters stretch from the curve  to the curve  

A. ?2
B. 25?2
C. 25?
D. ?2

Mathematics

Solve the problem.A building contractor finds that  can of pipe joint compound is needed to plumb each new home. How many homes can be plumbed with 24 cans of compound?

A. 60 homes
B. 24 homes
C. 30 homes
D. 9 homes

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Calculate.-107 - (-12 ) - (-33) - (-69)

A. 7 B. -197 C. -7 D.  197

Mathematics

Use a graphing calculator to sketch the graph of the quadratic equation, and then determine the x-intervals over which the graph is increasing and decreasing.y = x2 + 2x + 6

A. Increasing: (x > 1), Decreasing: (x < 1) B. Increasing: (x < 1), Decreasing: (x > 1) C. Increasing: (x > -1), Decreasing: (x < -1) D. Increasing: (x < -1), Decreasing: (x > -1)

Mathematics