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In general, the imperfect tense is used to describe uncompleted actions whereas the perfect tense is applied when an action is complete. 

1. The imperfect explains what happened with no referenc...

Receptors are specialised cells used to detect, stimuli or even convert stimulus in to an impulse. They are usually found in sense organs like the eye, which has light sensitive receptors known as retina,...

let sin(x)=u , let cos(x)=v

du/dx = cos(x),   dv/dx = -sin(x)

d[sin(x)cos(x)]/dx = v.du/dx + u.dv/dx

= cos^2(x) - sin^2(x)

The probability they wear glasses is 3/7, which means the probability they don't is 1-3/7=4/7. This means 164 students make up 4/7 of the school. To find the number that wear glasses we need to find how m...

Whilst there are stages to follow during the design process, these stages are iterative. This means that if you go from stage 1 to 2 to 3, this does not mean you have to keep going, and can return to prev...