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 ? B) = n(A) + n(B)
A. True
B. False
Answer: A
Mathematics
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Find the specified domain.For f(x) = x2 - 4 and g(x) = 2x + 3, what is the domain of f - g?
A. (-2, 2) B. [2, ?) C. (-?, ?) D. [0, ?)
Mathematics
Solve. Write the answer as a mixed number in simplest form.Mark is filling decorative oil lamps for a reception. Each lamp can hold 
cup of oil. Mark has 4
cups of oil available. How many oil lamps can Mark fill completely?
A. 9 oil lamps
B. 10 oil lamps
C. 11 oil lamps
D. 8
oil lamps
Mathematics
Use I = Prt for simple interest to find the indicated quantity.P = $13,500; t = 4 months; I = $517.50. Find r.
A. 11.7% B. 7.7% C. 3.8% D. 11.5%
Mathematics
Find an equation for the ellipse described.Center at (0, 0); focus at (5, 0); vertex at (7, 0)
A. 
+ 
= 1
B. 
+ 
= 1
C. 
+ 
= 1
D. 
+ 
= 1
Mathematics