Inserting equations

Here are some tips on formatting equations:

• Number equations for future referencing
• Use an equation editor where necessary to produce clear equations 
• If there is more than one equation, equations should be listed and described separately. 
• They should be indented or centered from the rest of the text
• There should be a space separating them from text both above and below  the equation
• All variables should be defined directly after or directly before the equation

Example:

The annual probability p of a single season without a hurricane landfall was calculated for a 160 year period by   calculating the number of years n without a landfall event over the total number of years N in the dataset:

p = n/N     (1)

The annual probability was used in tandem with the binomial distribution to determine the likelihood P(X) of  X years free of a hurricane landfall occurring over a finite period of N years:

                                                  (2)

Calculations were performed for values of N=11 and X=5.