Consider the universal relation r= {a, b, c, d, e, f, g, h, i, j} and the set of functional dependencies f.

f = {{a, b} _{c, d},

{d}=> {e, f, g},

{f, g}_{h},

{a}+{i},

{a, b} {e, g},

{a, i} + {i, j}}

(a) what is the closure of the set {a, d}?

(b) what is the key for r?

(c) what is the minimum cover for the set of functional dependencies f?

(d) decompose r into 2nf.

(e) decompose r into 3nf.

Technician a says that the radiator usually cools better if the front air dam is removed. technician b says that when a condenser has a leak it can be repaired easily with epoxy. who is correct?

Write a car class having two private member variables called tank and speed. write public methods called pumpgas and gofast. the method pumpgas gets an integer for gas that must be pumped. that value needs to be added to tank (no more than 20 gallons). it must return the amount of gas that is purchased ($4 per gallon). the method gofast should increase the speed by 5 each time it is called.write a constructor for the above class that initialized both variables to zero.write a tostring to display both the tank and speed when the car is printed.modify the car class to implement the interface comparable and an interface called carinter having the public methods in carinter.write the main program to create an array of size 5 of type car. create 5 car objects having each location of the array to refer to one of the cars. test the pumpgas, gofast, equals method on the array items. write an enhanced loop to print all the car values (using a tostring written last time).write a generic method to find the minimum of four items. pass int, double, char, string and car objects to test this method.

What engine component is shown in the above figure?