DAC = BAD What is the length of AC? Round to one decimal place

This is different from the first one can someone me

Atriangle has verticals at b(-3,0), c(2,-1), d(-1,2). which transformation would produce an image with verticals b”(-2,1), c”(3,2), d”(0,-1)?

According to the general equation for conditional probability if p(anb)=3/7 and p(b)=7/8 what is p(a i b)