What are the domain and range of the real-valued function f(x)=-3+4x-12?

Aportion of a line bounded by two points is defined as

Abike shop sells you a bicycle for $63 and a helmet for $21. the total cost is 150% of what the shop spent originally. how much did the shop spend originally? how much profit did the bike shop earn by selling the bicycle and helmet to you ?

Linda loans her friend $250 with a 5% monthly intrest rate. how much was the whole loan?