Does anyone have any good article or video recommendation for combining inequalities when signs are in different and same direction?

say 0.5<x<0.75

and 0.285<y<0.57

then can we say that 0.1425<xy<0.427?

Does anyone have any good article or video recommendation for combining inequalities when signs are in different and same direction?

say 0.5<x<0.75

and 0.285<y<0.57

then can we say that 0.1425<xy<0.427?

Yes, but be careful when the numbers are negative

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Could you pls share any good article or video recommendation for combining inequalities when signs are in different and same direction?