What are the determinants of demand?
income
price of related goods
a good's own price
technology
tastes and preferences
resource prices
number of consumers

Income  

Price of related goods  

A good's own price  

Tastes and preferences

Number of consumers

Explanation:

A good’s own price: the law of demand states that when prices rise, the demand falls. That also means that when prices drop, demand will grow.  

Income: when income rises, so will the quantity demanded. When income falls, so will demand.

Prices of related goods: these are either complementary, those purchased along with a particular good or substitutes. They can also influence the demand.

Tastes and preferences: when the consumer’s tastes or preferences change in favor of a product, so does the quantity demanded.

Number of consumers: it has a major effect on the demand. As the number increases, the demand rises.

answer: it is a cellular phone

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. : )