First estimate the answer. Then add or subtract to find the exact answer. Write answer as a mixed number. 
A. Estimate: 5; Exact: 3
B. Estimate: 4; Exact: 3
C. Estimate: 4; Exact: 4
D. Estimate: 5; Exact: 4
Answer: D
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Graph the function.y = 4 cot (3x)
A. 
B. 
C. 
D. 
Solve the problem. Round money amounts to the nearest cent.A jug of punch contains 4 L. How many 320 mL servings are in one jug?
A. 1.25 servings B. 125 servings C. 12.5 servings D. 1280 servings
Answer the question.True or False: The point at which a line crosses the x-axis, where y is zero, is called the 
A. True B. False
Solve the problem.For a hyperbolic mirror the two foci are 38 cm apart. The distance of the vertex from one focus is 7 cm and from the other focus is 31 cm. Position a coordinate system with the origin at the center of the hyperbola and with the foci on the y-axis. Find the equation of the hyperbola.
A. 
- 
= 5
B. 
- 
= 5
C. 
- 
= 1
D. 
- 
= 1