What is this expression in scientific notation

Ab and bc form a right angle at point b. if a= (-3,-1) and b= (4,4) what is the equation of bc?

A.s.a.! similarity in right triangles, refer to the figure to complete this proportionc/a = a/? a.) cb.) hc.) rd.) s

Due to bad planning, two of the local schools have their annual plays on the same weekend. while 457 people attend one, and 372 attend the other, only 104 people were able to attend both. how many people went to at least one play?