Find the standard-form equation of the hyperbola centered at the origin which satisfies the given conditions.Vertices at (0, 4) and (0, -4); foci at (0, 9) and (0, -9)
A. 
- 
= 1
B. 
- 
= 1
C. 
- 
= 1
D. 
- 
= 1
Answer: C
Mathematics
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Find the exact value of the expression.cos 40° cos 20° - sin 40° sin 20°
A. 
B. 
C. 
D. 
Mathematics
Find all values of x in the interval [0°, 360°) that satisfy the equation. Round approximate answers to the nearest tenth of a degree.7 cot2 x - 5 = 0
A. {70.5°, 109.5°, 180°} B. {103.2°, 145.2°, 283.2°, 325.2°} C. {49.8°, 130.2°, 229.8°, 310.2°} D. {51.8°, 128.2°}
Mathematics
Find the indicated angle.A roof is inclined at an angle of 27.04°. Find the complement of this angle.
A. 63.06° B. 62.06° C. 62.96° D. 63.96°
Mathematics
Add or subtract terms whenever possible.3
+ 
A. 11
B. 5
C. 4
D. 3
Mathematics