Answer:

Explanation:
The missing information is
- a to c is 3m .
- c to b is a .
- b to a is c and ab is 50 degrees.
The image attached shows a representation of the situation.
Notice that c is the hypothenuse of the triangle, and we know the measure of one angle and its opposite leg, so that allow us to use the sine trigonometric reason.


Therefore, the expression that can be used to find the side c is
