Which of the following statements is always true? . a. acute triangles are scalene.. b. scalene triangles are acute.. c. acute triangles are equilateral.. d. equilateral triangles are acute..

There could be no correct answer in this one because all of the statements are false. Acute triangles can sometimes be scalene but not always. Acute triangles have acute angles which mean it is less than 90 degree. So it's not equilateral.  

Sis less than or equal to 75 (bottom left)