10x+18=8x+4 please and thank you

What is the length of the unknown leg in the right triangle ?

To describe a sequence of transformations that maps triangle abc onto triangle a"b"c", a student starts with a reflection over the x-axis.how should the student complete the sequence of transformations to map triangle abc onto triangle a"b"c"? plz

How many lines can be drawn through points j and k? 0 1 2 3