Find sin theta if theta is in quadrant 3 and tan theta= 3/4
a. 0.958
b. -5/3
c. -3/5
give explanation if possible.

Ok, so tantheta equals opposite/adjacent, so if you have lengths 3 and 4 as legs of the triangle, you have a Pythagorean teille, 3 4 5, so sintheta equals opposite/hypotenuse, or in this case 3/5, this would be negative though because it's in quadrant 3, so the answer is C. -3/5