Susan incorrectly factored the expression below. (the top one is the original and the bottom is her factoring it) The question is on the left

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

Option 1: $30 an hour plus a nonrefundable deposit of $50 option 2: $20 an hour plus a nonrefundable deposit of $75 kyle is renting a jetski for the day. if he can rent the jetski in one hour increments, what is the minimum number of hours must he rent the jetski for option 2 to be a better deal then option 1?

Find the value of the cosine for angle a