The phrase "apply a number of" is correct and usable in written English.
It can be used when discussing the implementation or utilization of multiple items, methods, or strategies in a particular context.
Example: "To improve efficiency, we need to apply a number of new techniques in our workflow."
Alternatives: "utilize several" or "implement multiple".
You can also apply a number of dramatic filters that will make your photos turn black and white or give them an old sepia tone.
Before proceeding to the clinical application step of decellularized scaffolds, it is greatly important to apply a number of biocompatibility tests in vitro and in vivo.
Finally, we apply a number of metrics on the identified patterns to evaluate the appropriateness of reuse which results in categorizing them as effective or poor design solutions.
A Hipstamatic app will allow people to apply a number of different filters to their photos before sharing them on social networks like Facebook, Tumblr, Twitter, Foursquare and Instagram.
In this paper, we apply a number of these basic ideas in a slightly different way with more modern and efficient estimation techniques.
Although mine operators apply a number of conventional management practices to control sulfate and chloride discharges, some still have difficulty in controlling the level of these pollutants.
We have applied a number of novel X-ray spectroscopic tools to Fe/ZSM-5 systems.
Experimental results obtained by applying a number of algorithms to a set of randomly generated networks are presented and compared.
We have applied a number of analytical techniques to compare the chemical, structural and electrical properties of these films.
When the worldwide financial crisis hit in 2008, Brazil weathered the storm, and applied a number of policies to keep its domestic economy going.
When I put this question to business analysts, several pointed me in the direction of Louisiana, which has applied a number of Romney's principles.
