Perform the indicated operations and express your answer in the form a + bi. 
A. ±4
B. -4i
C. 4i
D. -i
Answer: C
Mathematics
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Determine the limit by sketching an appropriate graph.
f(x), where f(x) = 
A. 19 B. 0 C. 16 D. 13
Mathematics
At what points is the given function continuous?f(x, y) = 
A. All (x, y) such that x ? - y B. All (x, y) ? (0, 0) C. All (x, y) D. All (x, y) such that x ? y
Mathematics
Determine whether the variation between the indicated quantities is direct or inverse.The height of a tower and the time it takes for a marble dropped from the top of the tower to hit the ground.
A. Inverse B. Direct
Mathematics
Add or subtract.
+ 
A. 
B. 
C. 
D. 
Mathematics