Which of the following uses the reciprocal property to rewrite x/5 = 72/4

Please help me :)

What is the value of the expression below? (81^2)^1/8

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

If sina is 4/5 then find the value of sin3a . with explanation.