Add or Subtract:
(4a^2 - 1) / (a^2 - 4) - (2a - 1) / (a - 2)

Step-by-step explanation:

Start by factoring into :

.

Multiply the right side by to set the denominators equal to each other:

Since denominators are now equal, add the numerators:

This is completely simplified

an advantage of the standard deviation is that it increases as the dispersion of the data increases. e. the interquartile range is preferred when the data are not skewed or no have outliers. an advantage of the standard deviation is that it uses all the observations in its computation.

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step-by-step explanation: