Using the Law of Cosines, find angle C if a = 10, b = 20, and c = 15.
a. 46.6ø
b. 43.4ø
c. 133.5ø
d. 86.8ø
e. 66.7ø
a. 46.6ø
Mathematics
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Provide an appropriate response.A 
ladder is placed against a wall. If the top of the ladder is sliding down the wall at 3 feet per second, at what rate is the bottom of the ladder moving away from the wall when the bottom of the ladder is 9 feet away from the wall?
A. 4.9 ft/sec B. 5.4 ft/sec C. 8.1 ft/sec D. -8.1 ft/sec
Mathematics