When the demand for automobiles is high, the demand for workers who build automobiles is high. This relation between the market for automobiles and the market for the labor that builds automobiles is why demand in a factor market is called:

Derived demand

Explanation:

Derived demand is the  demand for a factor of production  or an intermediate good used in the production of the final good.

If automobiles were not being produced, there would be no demand for labour. so, the demand for labour is dependent on the automobiles being produced. this is an example of derived demand.

answer; communication channel;

x=3

step-by-step explanation:

this is really simple i saw that there was only one term (5x) and thought if that was 15 what would i have to multiply everything else to get it there? well if 5x became 15 then x would have to be 3 so plug the 3 in the x for the other equations and you get 15 for the other ones. so there you go. : )