Plot 1+5i on the complex plane

The first five terms of a linear sequence are given below. 7 , 12 , 17, 22 , 27 , what is the next term of the sequence?

One line passes through (-7,-4) and (5,4) . another line passes through the point (-4,6) and (6,-9)

Astick 2 m long is placed vertically at point b. the top of the stick is in line with the top of a tree as seen from point a, which is 3 m from the stick and 30 m from the tree. how tall is the tree?