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If you're looking for books, have a look at Schaum's Outline of Precalculus [0]. Khan Academy [1] is also good and there's this MOOC on coursera called Data Science Math Skills [2].

Khan Academy probably has this covered.

A shame Google doesn’t just link to the Khan Academy course.

not true. they do have khan academy link where applicable. for example for the algebra ones. check below link https://developers.google.com/machine-learning/crash-course/...

I always liked the Saxon books[1], since they involved so much spaced repetition if you did the problem sets that it beat the symbolic manipulation into your long-term memory.

[1] http://amzn.to/2FH3bXL