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.If B ? A, n(B) = n(A) - n(A - B).
A. True
B. False
Answer: A
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In a certain city there is a river running through the middle of the city. There are three islands and nine bridges as shown in the figure below.
A graph that appropriate models this situation would have
A. 9 vertices and 3 edges. B. 3 vertices and 9 edges. C. 9 vertices and 5 edges. D. 5 vertices and 9 edges. E. none of these
Perform the operation indicated. Simplify.
+ 
A. 
B. 
C. 
D. 
Factor the expression. Express your answer so that only positive exponents occur. 9x1/7 - 7x-5/7
A. x1/3(9 - 7x6/7) B. x-5/7(9x6/7 - 7) C. x1/7(9x6/7 - 7x6/7) D. x-5/7(9x6/7 - 7x)
A toy store bought toy trucks for $9 each and dolls for $8 each for a total cost of $1772. They sold all the trucks for $15 each and all the dolls for $12 each and received a total of $2796. How many of each were purchased?
What will be an ideal response?