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They are both prepositions that can be translated as "for" in English. As a rule, you can think of "por" as anything that explains the reason or the means/way through which you do some...

Upper bound of Peter's height = 185cmLower bound of Peter's height = 175cmUpper bound of Alice's height = 155cmLower bound of Alice's height = 145cmFor the upper bound of the difference, we want the upper...

Diffusion is the passive process by which molecules move across a semi permeable membrane down their concentration gradient from an area of high concentration to low concentration. An example is gaseous e...

53 x 6 = 318320-318 = 2There are not enough coaches for the amount of people. 2 people would not be on a coach. 7 coaches are needed to ensure everyone has a seat on a coach.

I would firstly suggest that before you begin writing an answer you must identify the keyword in the question and create a brief plan. Identify the keyword in the question by either highlighting it or und...