Fixed cost is
a) fixed in total and decreases per unit as the number of units increases.
b) a variable cost is fixed in total and decreases per unit as the number of units increases.
c) a variable cost is variable in total and decreases per unit as the number of units increases.
d) a variable cost is variable in total and increases per unit as the number of units increases.

b. a single paragraph.

a paragraph is a series of sentences that are organized and make sense, and are all related to a single topic . almost every piece of writing you do that is longer than a few sentences should be organized into paragraphs. this is because paragraphs show a reader where the subdivisions of an essay begin and end, and thus the reader see the organization of the essay into subjects in order to be able to understand its main points.

you have to put the parentheses like this:

in fact, you have to perform the operation inside parentheses first, and then proceed in order:

answer; balance sheets;