I've come across Linear Interpolation as a method for working out a programming need I have. Several examples I've seen show a algebraic expression that my not sure how to operate:
What are the operations needed at point 1, 2, 3?
Please excuse my language/definition ignorance (and tag selection), it's been a long time since I've had to do this sort of maths!
It is just a multiplication. In mathematics, it is normally denoted by juxtaposition of arguments.