You multiply vectors and scalar simply by multiplying each component by that scalar:

Finally, you sum two vectors by summing the correspondent coordinates:

Answer:0.03
Step-by-step explanation:1.26/42
Since the others are congruent and linear so is a and b!!!!!!!!
1st month +450
-60 x 4 months = -240
6th month + 125
Total: 450 - 240 + 125 = $335 profit