Question

read the paragraph from the section \math in flight.\
pilots use math all the time. for example,
calculating the total weight of an aircraft
requires using the four operations: addition,
subtraction, multiplication and division.
knowing this precise information is important
for safety, because if a plane is too heavy, it
impacts its ability to take off and land.
adding which of these sentences to the article would help
explain the meaning of the word \precise\ in the context
of the article?
a the calculations must be exact for safetys sake.
b the information pilots use often changes during
flights.
c confusing or misleading information can be
dangerous for pilots.
d pilots must take the planes weight into
consideration before taking off.

Explanation:

The word "precise" means exact. Option A uses the word "exact" which is a synonym for "precise" in the context of calculations being necessary for safety. Option B talks about changes in information, which has no relation to the meaning of "precise". Option C mentions confusing or misleading information but does not directly explain the meaning of "precise". Option D is about considering the plane's weight, not about the meaning of "precise".

Answer:

A. The calculations must be exact for safety's sake.