Is it possible to write the vector (−5, 6) as a linear combination of the vectors (1, 2) and (3, 4)?

Of the 304 people who attended a school play, 5/8 were students. how many of the people who attended were students.

Which sequence is arithmetic? 6, 12, 15, 21, 7, 14, 21, 36, 8, 16, 32, 64, 9, 18, 27, 36,

Is vi-cos = -sintrue? if so, in which quadrants does angle terminate?