Divide displayed expressions before the equals sign or the sign ...

[tiffannnnyyyyyy]

Divide displayed expressions before the equals sign or the sign of operation when the expression ___________________ _________.
 
  a. extends beyond one line
  b. uses fractions
  c. requires at least two footnotes
  d. requires two operations

Question 2

You should use no more than _________________ numbered subheadings in documents.
 
  a. three
  b. four or five
  c. six or seven
  d. a pair of

[xiazhe]

Answer to Question 1

a

Answer to Question 2

b