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When do you use the perfect tense as opposed to the imperfect tense?

In general, the imperfect tense is used to describe uncompleted actions whereas the perfect tense is applied when an action is complete. The imperfect explains what happened with no reference to specific tim...
PM
Answered by Phoebe M. • French tutor
2585 Views

Describe the difference between the function of an effector and receptor, giving an example of each.

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, it...
HL
Answered by Hadijat L. • Biology tutor
9566 Views

Differentiate sin(x)cos(x)

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)
JD
Answered by James D. • Maths tutor
5481 Views

The probability a student in a school wears glasses is 3/7. There are 164 students who DON'T wear glasses. Find the number that wear glasses.

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 many...
AR
Answered by Alice R. • Maths tutor
6834 Views

What is meant by an iterative design process?

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 previou...
AB
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