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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...

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...

We know that the perimeter of the triangle is 20cm and we also know the value of two of the sides of the triangle, AB=7cm and BC=4cm. We can work out the length of the third side (AC) by subtracting the k...

Since potassium is an alkali metal (first column of periodic table), it has one electron in its outer shell. Sulfur, however, has six electrons in its outer shell. In an ionic bond, electrons are donated ...