Solve the problem.Let n(A) = 4, n(B) = 9, and n(A ? B) = 2. Find n(A ? B).
A. 10
B. 11
C. 12
D. 13
Answer: B
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Write each rate as a unit rate.
?
people living in 
square
A.
people per square mi
B.
people per square mi
C.
people per square mi
D.
people per square mi
E.
people per square mi
Determine whether the growth (or decay) is linear or exponential, and answer the associated question.The price of computer memory is decreasing at a rate of 10% per year. If a memory chip costs $79 today, what will it cost in two years?
A. Linear; $94.80 B. Exponential; $71.30 C. Linear; $63.20 D. Exponential; $63.99
Solve the problem.Which apportionment method does not violate the quota rule and does not suffer from any of the paradoxes?
A. Jefferson's method B. Webster's method C. Adams's method D. Hamilton's method E. There is no such method.
Solve the problem.The radius of the tires of a car is 18 inches, and they are revolving at the rate of 651 revolutions per minute. How fast is the car traveling in miles per hour?
A. 
? mph
B. 
? mph
C. 
? mph
D. 
? mph