Answer:

Step-by-step explanation:
To find sin B, you should use the rules of SOH CAH TOA.
- SOH - which is for Sin = Opposite/Hypotenuse
- CAH - which is for Cos = Adjacent/Hypotenuse
- TOA - which is for Tan = Opposite/Adjacent
so the opposite side of B would be 3 and the hypotenuse of the triangle is 5 which gives the answer
