Simplify.(
+ 4)(
- 4)
A. 22
B. 2
C. 6 - 2
D. -10
Answer: D
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Graph the function.y = -2 sin 5x
A. 
B. 
C. 
D. 
Solve.An earthquake had an intensity 
times more powerful than a reference level earthquake, or 
What was the magnitude of this earthquake on the Richter scale? The magnitude on the Richter scale of an earthquake of intensity I is 
A. 14.5 B. 16.3 C. 6.3 D. 3.7
Solve the problem using matrices.The figure below shows the intersection of three one-way streets. To keep traffic moving, the number of cars per minute entering an intersection must equal the number of cars leaving that intersection. Set up a system of equations that keeps traffic moving, and use Gaussian elimination to solve the system. If construction limits z to t cars per minute, how many cars per minute must pass through the other intersections to keep traffic moving?
A. t + 8 cars/min between I2 and I1; t + 3 cars/min between I1 and I3 B. t - 2 cars/min between I2 and I1; t + 1 cars/min between I1 and I3 C. t + 2 cars/min between I2 and I1; t - 3 cars/min between I1 and I3 D. t + 1 cars/min between I2 and I1; t + 4 cars/min between I1 and I3
If a tree casts a shadow of 5 ft 8 in. at the same time that a 6-ft 11-in. person casts a shadow of 4 ft 2 in., find the height of the tree (to the nearest inch). ?
A. 8 ft 4 in. B. 11 ft 6 in. C. 9 ft D. 9 ft 5 in. E. 9 ft 4 in.