Question

What's the answer and how to work it

Answer 1

Obtuse. that's correct
because triangle MNP has m<M = 35 and m<P = 47
the other angel m<N should be : 
m<N = 180 - (m<M + m<P)
m<N = 180 - (35 +47)
m<N = 180 - 82
m<N = 98

m<N = 98 is an obtuse angel which is greater than 90

An obtuse triangle is a triangle in which one of the angles is an obtuse angle.

Answer: triangle MNP is an obtuse triangle