Brilliant that you're looking for. I may be able to help toy find one depending on your requirements. I don't class myself as one. Is it for an adult or child, what's their knowledge of languages, are you looking to read or understand 

Islamic Studies

Quran teacher

Origin at 0,0 means equation is
X2 + y2 = r2

We just need to find r.
A little bit of trignometry, right angle triangles and there you go.

First we find the angle at left edge of triangle boung by two axes and base 30 h 10.
Tan theta = 10/30
Calculator,
Theta = 18.4 degrees
Then you take the triangle bound by x axis 30
And radius r
With angle 18.4
Sin 18.4 = r/30
R comes out to be 9.49 units 

So that goes back into your equation of circle and there you have it. 


Maths

C is a circle with centre the origin. A tangent to C passes through the points (-30, 0) and (0, 10) Work out an equation of C. You must show all your working.

Initial velocity u = 19m/s
Final velocity v = 0m/s at the top
Acceleration a = G = - 9.8m/s2
We need the distance s.

Equation that contains these variables but not time is
V2 = u2 + 2as
U2 = - 2as
U2 / 2a = - s

Putting values in 
19^2 / 2 * - 9.8 = - s
361/19.6 = s
S=18.41m 

Ignore the syntax capital lower case etc. 

Hope this helps 

Physics

A ball is thrown vertically into the air with an initial velocity of 19m/s. What height will it travel upwards before it starts to reverse its direction?

The concept of ROM is of a memory block that's not modified. This means that the computer can start reading instructions and data from that location every time it has to start up and this block of memory will have essential information required to start a computer (operating system) successfully. In real life pcs or phones, this memory blicj is often updated by firmware updates or bios updates and if you somehow mess it up, you risk bricking your phone for instance. 

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