Solve the problem.The difference between a country's exports and imports is called the country's trade balance. In 1997, a country had $71 billion in exports and $157 billion in imports. What was the country's trade balance in 1997?
A. -$86 billion
B. -$228 billion
C. $228 billion
D. $86 billion
Answer: A
Mathematics
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Determine whether the function is a solution of the wave equation.w(x, t) = cos (3t - 3cx), c ? 1
A. Yes B. No
Mathematics
Solve the problem.Write 
+ 
+ 
as a single iterated integral.
A. 
B. 
C. 
D. 
Mathematics
Solve the problem.A rock is propelled upward from the top of a building 130 feet tall at an initial velocity of 88 feet per second. The function that describes the height of the rocket in terms of time t is 
Determine the maximum height that the rock reaches.
A. 251 feet B. 287 feet C. 268 feet D. 234 feet
Mathematics
Perform the indicated operation and simplify. Write the answer in the form a + bi.
A. 
+ 
i
B. 
- 
i
C. 
+ 
i
D. 
- 
i
Mathematics