Estimate the instantaneous velocity at t=2

Which statement accurately explains whether a reflection over the x-axis and a 180° rotation would map figure acb onto itself?

Which of the following correctly justifies statement four of the two column proof? a. corresponding angles theorem b. transitive property of equality c. vertical angle theorem d. substitution property of equality

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