Conductors help the musicians count and when to change volume. Also they help the musicians come in at the right time or to stop
A model is a three-dimensional of a person/thing or of a proposed structure.
A mock up is a model or replica of a machine or structure, used for instructional or experimental purposes.
A prototype is a first or preliminary version of a device or vehicle from which other forms are developed.
Answer:
here's the math hope it helps
The subject. a photographer could stay in the same position and manipulate the light source, light
