Solve.A nuclear cooling tower cross section is a hyperbola having a diameter of 62 ft at the center. The distance between the two foci is 90 ft. What is the equation for the hyperbola?
A. 
- 
= 1
B. 
- 
= 1
C. 
- 
= 5
D. 
- 
= 1
Answer: B
Mathematics
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Solve the formula for the specified letter.I = 
for r
A. r = 
- IR
B. r = 
C. r = 
D. r = 
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