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What is the difference between the usage of the imperfect an the present perfect ?

Well, it is important to understand that the imperfect is a tense used to describe a habitual or continuous action in the past. It can be used to describe the environment of a situation or simply an actio...

MG
1691 Views

If f(x)=x^2 and g(x)=5x-11, then what is fgg(x) when x=3?

g(3)=5(3)-11=15-11=4gg(3)=g(4)=5(4)-11= 20-11=9fgg(3)=f(9)=92=81fgg(3...

SM
Answered by Simon M. Maths tutor
3790 Views

Solve the simultaneous equations. (1) 2x + y = 18 (2)x − y = 6

In these simultaneous equations, there are two unknowns. The first is x, the second is y. The aim of a question like this is to find what x and y are equal too. A method to doing this is to rewrite one eq...

SW
Answered by Samantha W. Maths tutor
4511 Views

Describe the perfect ionic model

In this model ions are considered perfect spheres and therfore point charges. In this model ions have only electrostatic attraction with no covalent interactions.

JS
5736 Views

Define a geostationary orbit

A geostationary orbit is one that appears in the same location as seen from an observer on earth. This requires three criteria; It's orbital period must be 24 hours The orbit must be above the equator at...

JS
Answered by Jonathan S. Physics tutor
2419 Views

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