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The subjunctive, despite sometimes being referred to as a tense, is in fact a mood. The reason for this is because it's used by speakers to express actions depending on certain factors. These factors can ...

With differentiation we should always begin with the "times by the power and take one from the power" rule. For example, to differentiate ax^b --> (a x b)x^(b-1)

So...

x=-1/7 or -1/3

y=-3/7 or 1/3

The imperfect tense should be used when: describing something one did in the past on a regular basis; setting the stage for another action (i.e. i was reading when he came in, leía cuando en...

The natural greenhouse effect is how the atmosphere works to absorb and reflect radiation to keep the Earth warm. The sun emits short wave radiation towards the Earth. The Earth's atmosphere absorbs this ...