A, C, and E seem all right. In letter form: 1st 3rd and 5th
3-3 0
——- = —— = zero
-9-9. -18
It would be 12 x 3. This is because 4 x 3 is 12. He wants to triple the area. Multiply 12 by 3= 36. Hope it helps.
Using the law of sines, we have

And we know that

So, the equation becomes

0.5 or .5 (remember, half a whole note is a half note)