CPM Homework Help : PC Problem 2-117

Find the value of $x$ for each triangle.

Hint (a):
Find the 3rd angle. Should you use the Law of Sines or Cosines to solve for $x$ ?
Answer (a):
Law of Sines would be easiest.

Triangle labeled as follows: left side, 7, right side, x, bottom side, 5, left bottom angle, 120 degrees.

Hint (b):

Should you use the Law of Sines or the Law of Cosines to find $x$ ? Why?

Answer (b):

Use the Law of Cosines, because the Law of Sines needs an angle and a value of an opposite side.