Which property justifies the fact that 8(d-5) is equivalent to 8d-40

Which of the binomials below is a factor of this trinominal? x^2-13+30

Which steps could be part of the process in algebraically solving the system of equations, y+5x=x^2+10 and y=4x-10

Circle d circumscribes abc and abe. which statements about the triangles are true? statement i: the perpendicular bisectors of abc intersect at the same point as those of abe. statement ii: the distance from c to d is the same as the distance from d to e. statement iii: bisects cde. statement iv: the angle bisectors of abc intersect at the same point as those of abe. a. i only b. i and ii c. ii and iv d. i and iii e. iii and iv