Online math with teacher help? For students that are behind in math

I’m looking for a computer based program for math with a teacher or tutor available for answering questions.

My kids have fallen behind significantly in math, so they need to both catch up and progress forward, and none of us are particularly gifted at math so lessons take us forever and with many years-largest reason why they are behind.

Ideal situation would be to find a private tutor to work with them and accelerate them through their courses and fill in our gaps, but I’ve had no luck finding that locally. So a computer based program seems the next best option.