Please help number a

135 degrees

Step-by-step explanation:

let the inclination be theta.

Here, theta is the angle made by line AB in a positive direction.

So, 0 + 45 = 180

or, 0= 180-45

Therefore, 0=135

Hence, The inclination is 135

( Im not sure with my answer so check it yourself plz. The answer could be 45 degrees too)

(same book btw look at pg 142 example 1)

what is the original number? you forgot to add it.