Alan

These are just two points of an x-y graph. What do you want to know about them? The slope of the straight line between them or what?

Look at the differences between each term and you will soon spot the pattern.

Another way of looking at this is as follows:

Probability that the 1st card is a club = 13/52

Probability that the 2nd card is a club, given the 1st is a club is: 12/51

Probability that the 3rd card is a club, given the first 2 are clubs is:  11/50

Probability that the 4th card is a club, given the first 3 are clubs is:  10/49

Hence the overall probability that all four are clubs is the product of these = 13*12*11*10/(52*51*50*49)

This can be written as (13!/9!)/(52!/48!)  = (13!/[9!*4!])/(52!/[48!*4!]) = nCr(13,4)/nCr(52,4)  (or C(13,4)/C(52,4) using Chris's notation).

But the arcsine of 340 doesn't make sense (sine has to be between -1 and +1) so it's possible here the question is asking how to calculate sin(340°)^-1 or 1/sin(340°).  This can be done either by typing in 1/sin(340) or sin(340)^-1 and pressing = or Enter.

At 1/5 of a field a day it will take 5 days for one field, so it will take 3*5 = 15 days for 3 fields.

This is a constant as you have written it.  y = -2.  Did you mean y = -8x + 6 ?  If so, what is your question?  Do you want it graphed?

Here is the graph:

I'll leave you to find the values of x and y at the intersection.

As below:

This means -1.885x10^-5, or -0.00001885

The "E" is often used in text-based computer programs.

Usually, to find the turning points of a function you need to differentiate it and set the result to zero.  If the function has two minima it must have at least one maximum so you might have to solve a cubic equation to find the turning points.

This would probably be clearer if you gave a specific example.