Factor the expression completely. 
Definitions:
Heights
The measurement of someone or something from base to top or head to foot.
Statistically Significant
An indication that the likelihood of the observed data, under the assumption of the null hypothesis, is low enough to reject the null hypothesis.
Electronic Control
The use of electronic systems to regulate the operation of mechanical devices, commonly found in automotive, industrial, and consumer appliance contexts.
Sampling
The process of selecting a subset of individuals from a statistical population to estimate characteristics of the whole population.
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Q268: Perform the indicated operations and simplify.
Q305: Perform the indicated operations and simplify.