1a) For the first problem what you did was to first find anapproximationof the anwer in degrees and then you convereted that approximation to minutes, and then to seconds. But what I think they want is a more exact conversion expresed in degrees, minutes, and seconds:

So it's 120 degrees PLUS a bit more, and you need now to convert the remainder to minutes, then seconds:

Now convert this remainder of this to seconds:

which rounds to 16".

So you have: .

1b) To find the sine you can use a calculator, but it's very close to .

2) Your answers of and are good, but the other two answer are in the wrong quadrants - they have sine of +1/2. You can either add or subtract a multiple of 2 to your first two answers.