Which number from the set {9, 10, 13, 15} is the solution to this equation? 3(x − 7) = 9

Can (3,5 and square root 34) be sides on a right triangle?

To describe a sequence of transformations that maps triangle abc onto triangle a"b"c", a student starts with a reflection over the x-axis.how should the student complete the sequence of transformations to map triangle abc onto triangle a"b"c"? plz

How is working backward similar to solving an equation?