capnrefsmmat/khan-exercises — comment on commit dcf76a0258e3fe66a6a802eb85dc5ab800815227
File: exercises/dot_products.html line 50
By smenks13:

Why don't you put in a hint before this one that says, "The dot product of two vectors is defined as the sum of the products of the vectors' individual components." Just to give a reminder of the book definition.