Question

Qestion 19?

Answer 1

I tried this:

Explanation:

Consider the diagram for our vector:

where `veci` is the unit vector for the `x` axis while `vecj` is the unit vector for thr `y` axis.
As we can see the entire `alpha` angle is:
`alpha=90^@+90^@+90^@+beta`
we can find beta from trigonometry as:
`beta=arctan(1/4)=14^@`

giving:

`alpha=90^@+90^@+90^@+14^@=284^@`