What is the resultant of a and b if a = –2i − 5j and b = i − 4j? –i − 9j
9i − 9j
6i + 6j
9i + 9j

Use the matrix-column representation of the product to write each column of ab as a linear combination of the columns of a.

Naomi’s parents want to have 50,000, saved for her college education, if they invest 20000 today and earn 7% interest compound annually, about how long will it take them to save 50 thousand

Solve 3x-18=2y and 5x-6y=14 by elimination or substitution . show all !