Answer:
b. foreign key
Explanation:
In the database world, a foreign key is a field on one table and a primary key for another table. The purpose of a foreign key is to provide linkages between two or more tables. Given two tables A and B, and making A the point of reference, a primary key is a field that is unique in A while a foreign key is unique in B.
On another hand, a composite primary key is a combination of two or more fields/columns on database table that can be used to uniquely identify each row in the table.
In the database lingua, what we have is a unique key not a distinct key, though the two words are similar in meaning.
A duplicate key is used when an information may be repeatedly entered on a table.
So the correct option is a foreign key.
You would need to show a pic
Well if you have one I know it's cool but don't flip it all the time
Explanation:
Answer:
Task 1: T = c + (2.5n(A/M))+ m(1+r/100)ⁿ
Task 2: In both 5 & 10 years, Car A is more economical
Task 3: Printing returns the answer in a different dialogue box while return displays the answer in the same window.
Explanation:
Task 1:
C = Cost of car
n = Number of years
m = Maintenance Cost
r = Rate
M = Mileage per gallon
A = Annual mileage
T= Total Cost
T = c + (2.5n(A/M))+ m(1+r/100)ⁿ
Task 2
Car A In 5 years; T = 20000+ (2.5*5(15000/25))+1300(1+0.15)⁵= $30115
Car B In 5 years; T = 30000+ (2.5*5(15000/32))+1000(1+0.10)⁵= $37470
Therefore in 5 years, Car A is more economical.
Car A In 10 years; T = 20000+ (2.5*10(15000/25))+1300(1+0.15)¹⁰= $40259.225
Car B In 10 years; T = 30000+ (2.5*10(15000/32))+1000(1+0.10)¹⁰= $ 44312.49
Therefore in 10 years, Car A is still economical.
Task 3: Printing returns the answer in a different dialogue box while return displays the answer in the same window.
