How does spectroscopy provide evidence for the big bang theory

The transfer of heat through the movement of a gas or liquid a. convection b. conduction c. radiation

=force × distance a. work b. velocity c. pressure d. momentum

You are given a vector a = 125i and an unknown vector b that is perpendicular to a. the cross-product of these two vectors is a × b = 98k. what is the y-component of vector b?