When did electric instruments come to jazz?

The rythmetic note that has three beats is called

Answer the question in the image! i just need 4s answer but is 3 is wrong correct me uwu

Natural minor half steps between scale degrees 3 and 4; 7 and 8 harmonic minor half steps between scale degrees 2 and 3; 5 and 6 ascending melodic minor half steps between scale degrees 2 and 3; 5 and 6; 7 and 8 major half steps between scale degrees 2 and 3; 7 and 8