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The perfect tense is for actions that happened once in the past (e.g. I did) whereas the imperfect is for repeated actions (e.g. I was doing). So for something you used to do , you would use the imperfect...

Resolve forces perpendicular to the slope. No acceleration in this direction hence resultant force in this direction must equal zero:R = mg * cos(30) Apply Newtons second law in the direction parallel to ...

There are many different ways you can plan an essay response in exam situations and each person will approach it slightly differently. I advise you to practice planning in timed conditions and explore lot...

For example: 3(2a + 5) + 5(a - 2)
The key is to approach this question in two steps, with the first step being to expand the brackets before then simplifying where possible. A good method for expand...

I would show the student two methods of solving this answer.The first method by:Finding two numbers that multiply to make -3 and simultaneously add to make +2.The two num...