Simplify, if possible.
÷ (4b2 - 25a2)
A. - 
B. - 
C. 
D. 
Answer: A
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Solve.Two LORAN stations are positioned 208 miles apart along a straight shore. A ship records a time difference of 0.00086 seconds between the LORAN signals. (The radio signals travel at 186,000 miles per second.) Where will the ship reach shore if it were to follow the hyperbola corresponding to this time difference? If the ship wants to enter a harbor located between the two stations 19 miles from the master station, what time difference should it be looking for?
A. 80 miles from the master station, 0.000914 seconds B. 24 miles from the master station, 0.000914 seconds C. 80 miles from the master station, 0.000457 seconds D. 24 miles from the master station, 0.000457 seconds
Match the shaded region with the set operation.A ? B
A. 
B. 
C. 
D. 
Find the cardinal number for the set.D = {seven}
A. 0 B. 7 C. 5 D. 1
Find the unknown side of the right triangle. Use a calculator or square root table when necessary and round to the nearest thousandth.
A. 149.5 cm B. 17.292 cm C. 11.5 cm D. 299 cm