Random error is unpredictable and irregular variation in measurements, while systematic error is consistent and repeatable deviation from the true value in measurements.

Dear Sir/Madam exemplifies politeness and respect, addressing an unknown or unspecified recipient in a professional and inclusive manner.

Is it a or an history? Is it a historian or an historian? Most style guides prefer the use of "a" before history, but some people use "an" for words such as historian, historical and historic. With this in mind, the use of "a" and "an" can be seen as a stylistic preference of the writer.

Break refers to the action of causing something to separate into pieces, while brake refers to a device used for slowing down or stopping a vehicle.

"Indispensible" is a misspelling of "indispensable," (the "ible" should be "able") which means absolutely necessary, essential, or irreplaceable.

"Cematary" is a misspelling of "cemetery," which is a place where deceased individuals are buried and/or memorialized.

"Multiple faceted" is an incorrect or informal variation of the correct "multifaceted," which is an adjective used to describe something that has many different aspects, facets, or dimensions.

"Tweeked" is a misspelling of "tweaked," which means to make small adjustments or modifications to something in order to improve or fine-tune it.

Both "drier" and "more dry" are correct and compare the wetness of things. Meanwhile, a "dryer" is a machine used to remove the moisture from items.