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From which specific areas of calculus are these problems?

I want to prepare for my Calculus exam that is supposed to cover topics ranging

from Algebra to Differential Equations.

I had calculus long time ago (decade and a half), so I will have lots of catching up

to do. It seems to me that topics asked are not in differential equations, but

I cannot tell because I cannot recognize.

Would someone please look at the question below as well as the attached image and tell me which specific topics within Calculus I,II,III ... I need to study in order to know

how to answer these topics:

1) Find the distance from the point P (4,3) with coordinates x + 3y = 6