Determine whether the relation is a function.{(-7, 7), (-2, 4), (2, 7), (7, 4)}
A. It is not a function.
B. It is a function.
Answer: B
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Simplify the given expression using the definition for negative exponents. Assume that all variables represent nonzero numbers.
A. t5
B. t4
C. t
D. 
Solve the problem.The function A = A0e-0.00693x models the amount in pounds of a particular radioactive material stored in a concrete vault, where x is the number of years since the material was put into the vault. If 200 pounds of the material are initially put into the vault, how many pounds will be left after 120 years? Round to the nearest pound.
A. 83 lb B. 87 lb C. 112 lb D. 120 lb
Divide. Express your answer in standard form.
A. 
+ 
i
B. 
- 
i
C. - 
- 
i
D. - 
+ 
i
Write the numeral in the following problem as a decimal numeral. By decimal numeral, we mean the system we use in everyday arithmetic. ? DCCIX ?
A. 709 B. 48 C. 1,997 D. 2,001 E. 719