1. The problem statement, all variables and given/known data if vector : line a starts from co-ordinates (0,0) and ends at (5,3) line b starts from co-ordinates (0,0) and ends at (1,2) what angle to the x-axis does the vector (a + b) make? 2. Relevant equations tan ∅ = opposite / adjacent 3. The attempt at a solution we can work out what angle a makes then what angle b makes. then subtract angle b from a. tan a = opposite / adjacent tan a ^-1 (3/5) = a=30.964 tab b ^ (2/1) =b=63.435 b-a = 63.435-30.964 = 32.47 degrees is this correct?