What is the radius of sphere with a surface area of 100cm2

Which graph represents the following piecewise defined function?

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

Determine which expressions represent real numbers and which expressions represent complex number. asaaap! plis!