List with all the lectures and texts of solved problems: wehlou.com/hania/files/uu/Outline_Precalculus1.pdf
Link to the course: https://www.udemy.com/course/precalculus-1/?referralCode=BC31ADC3513CB5671594
The link above leads to the course, and it gives you « current best price », which is usually pretty low (10 to 14 dollars), but not always. If the price is higher than that, you can try apply the following codes (the same for all the courses): TPOT_FEB22 in February 2022, TPOT_MAR22 in March 2022, and so on.
These prices are constant, but dependent on your region (about 14 dollars in the USA, in Sweden 12.99 Euro, in Poland 46 zloty, about 8 dollars in Mexico, around 7 dollars in Indonesia, somewhat less than 5 dollars in India).