In English, we often drop the subject of a phrase, such as in these signs: Who are these signs written for? It's really *You, stop* or *You, yield* or *You, be alert for bears* (I'm not doing it). After internalizing a language, we can take hints without explicit instructions. But, to put it politely, math isn't usually well-internalized. Let's get clear about who the "math signs" are referring to.
In class there's the lesson about a specific formula, sure, but the meta-lesson is how well the experience went. What worked? What didn't? How can we get more of the first and less of the second?
I had another great chat with Nasos Papadopoulos on the wonderful MetaLearn podcast. Einstein’s Theory of Special Relativity has many consequences, including the famous equation E = MC² (Energy = Mass x Speed of Light²) and the notion that space and time are relative (observers can have different experiences of how large something is, or how much time elapsed).