1. 

   Hint (a):

   Set up a ratio using the tangent function.

b.

3. 

   Hint (c):

   You do not have an angle with an opposite side. So use the Law of Cosines.

   Answer (c):

   $≈ 11.72$

4. 

   Step 1(d):

   Drop a perpendicular line from angle F to AC.

   Step 2(d):

   Using the sine function, find h in terms of the sin $28°$ and $x$.

   Step 3(d):

   Set the area

   $(60) = \frac{1}{2}\text{(base)(height)}$

   Answer (d):

   $≈ 17.04 \text{ cm}$