Solve the problem.A hall 130 feet in length was designed as a whispering gallery. If the ceiling is 25 feet high at the center, how far from the center are the foci located?
Fill in the blank(s) with the appropriate word(s).
60 ft
Mathematics
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Find the sum of the geometric series for those x for which the series converges.
A. 
B. 
C. 
D. 
Mathematics
Find the absolute value.|71|
A. 71
B. 0
C. 
D. -71
Mathematics
Provide an appropriate response.How many real square roots does any positive number have?
Fill in the blank(s) with the appropriate word(s).
Mathematics
Perform the indicated operation. Express the answer in scientific notation.(8.9 × 102)(5.1 × 10-2)
A. 45.39 × 100 B. 45.39 × 10-4 C. 45.39 D. 4.539 × 101
Mathematics