Question

complete the sentence with the best correlative conjunctions.
learning algebra is useful because it ____ allows you to make complicated calculations involving unknown variables ____ prepares you for more advanced abstract thinking.
not only... but also
either...nor
either...nor
submit

Explanation:

The sentence is highlighting two positive aspects of learning algebra: making complicated calculations with unknown variables and preparing for abstract thinking. The conjunction "not only... but also" is used to connect two related positive statements, showing that both actions are true. "Either...or" is for presenting a choice between two options, and "neither...nor" is for negating both options, which don't fit the context here.

Answer:

not only... but also