solve (a problem); answer (a question); unravel (a riddle) / comb; untangle (hair)

untie; unravel; undo (a fastening); unwrap / dispel (doubts); clear up (a matter)

to use / to employ / to make use of, to apply / to spend

a certain one, particular one, specific one

specify, identify, determine

mathematics (field of study)

ceremony, ritual, function / type, style / (mathematics) a formula or expression

question, problem on homework etc. / a question; a matter (of time etc.) / a problem (something that needs to be dealt with); a trouble / an issue; a matter

use one thing for many purposes / work someone hard

to use one's head