5. sin(B)=3/5, найти AC.

If sin(B) = 3/5, then hypotenuse = 5 and opposite side = 3. Adjacent side AC = sqrt(hypotenuse^2 - opposite^2) = sqrt(5^2 - 3^2) = sqrt(25 - 9) = sqrt(16) = 4. Thus, AC = 4.