part i
research the term primary key. discuss what this means in the context of functions and relations. describe an example of the use of a primary key.
part ii
consider the example of the states of the united states and the senators of the united states. if you consider the set of states as a domain and the set of senators as a range, you can establish a relation based on associations between the senators and the states. this relation would not be a function because each state corresponds to more than one senator. however, if you reverse the roles of the domain and range, then the relation is a function because each senator is associated with only one state.
make up your own example of 2 real-world sets

Someone answer this asap rn for ! a discount store’s prices are 25% lower than department store prices. the function c(x) = 0.75x can be used to determine the cost c, in dollars, of an item, where x is the department store price, in dollars. if the item has not sold in one month, the discount store takes an additional 20% off the discounted price and an additional $5 off the total purchase. the function d(y) = 0.80y - 5 can be used to find d, the cost, in dollars, of an item that has not been sold for a month, where y is the discount store price, in dollars. create a function d(c(x)) that represents the final price of an item when a costumer buys an item that has been in the discount store for a month. d(c(x)) =

The height of a flare fired from the deck of a ship in distress can be modeled by h(t)= -2(8t^2-52t-28), where h is the height of the flare above water and t is the time in seconds. a. find the time it takes the flare to hit the water.

Measure of angles 31 (x+4) (3x+9) me