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Find the coordinates of the centre C and the length of the diameter of a circle with the equation (x-2)^2 + (y+5)^2 = 25

Equation of a circle -> (x-a) 2 + (y-b)^2 = r 2 where the centre = (a,b) and the radius = r Thus using the equation above we can conclude that the centre is (2,-5) In order to find the diamerer fo the cir...
MC
Answered by Michael C. • Maths tutor
6219 Views

How is the structure of a red blood adapted to its function?

Red blood cells are shaped like a biconcave disc - increases SA:volume ration -> increase surface for oxygen to diffuse in and out of cell Red blood cells are very small - 7um, compared with 40um average ...
NB
Answered by Norbert B. • Biology tutor
15559 Views

What's the difference between 'on' and 'nous'? I've heard that both mean 'we' but I don't know which one to use.

It is true that ' on ' and ' nous ' both mean ' we ' and can be used pretty much interchangeably but there are subtleties to be aware of when using them. Although you can use both, they are used in different...
GD
Answered by George D. • French tutor
17557 Views

A photon has an energy of 1.0 MeV. Calculate the frequency associated with this photon energy. State an appropriate unit in your answer.

The energy contained in a photon is given by the formula E = hf, where h is the Planck constant and f is the frequency of the photon. Since h = 4.1 10 −15 eV s, f = E/h = 1.0 10 3 eV / (4.1 10 −15 eV s) = 2....
GN
Answered by Giovanni N. • Physics tutor
17703 Views

How do you remember how to conjugate for each tense?

The best way for me to personally learn and remember is by creating/ noticing patterns. There will always be a pattern with conjugations, even for the irregular verbs. For example, present tense endings I sa...
NP
Answered by Nina P. • Spanish tutor
2727 Views