Part (ii) requires dissecting the shaded region into three different parts. We must include a small portion of the unshaded part near A .during the computation. I will do up the answers by 3 am if no one has done them yet.

should we find the x-intercept of the line y=3-2x with the graph?...like is that step necessary? If so, I also have difficulty solving that equation. Thanks for your help. :)

Yes, this is quite important as the given integral value contains 1.5 as the lower bound.

Solving for the x intercept is straightforward as we know that y = 0, so 3 - 2x = 0 and this leads to x = 1.5.