When picking a movie on coto movies what does cast and no cast mean under quality

How do you make a lenny face? plz, brailiest to who can answer first.

Singing in the rain: this first part of the film shows the early history of motion picture. how accurate do you think the portrayal of the early motion picture industry is? why? is historical accuracy important in films and theater productions? explain.

Whats three fourths of 15(this is supposed to be in math but i clicked too fast)