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Soloha48 [4]
1 year ago
9

What are backup storage devices of computer? Why are they necessary in the computer system?​

Computers and Technology
1 answer:
Rina8888 [55]1 year ago
7 0

Answer:

Backup storage devices retains current copies of data on hand, enabling backup in the event of hardware failure or data loss. Backup storage, unlike long-term, archive, or cold storage, must allow for the quick recovery and restoration of backup data. Backup storage devices are disk-based hardware appliances that include specialized software for encryption, interconnection, data processing, and compression. A remote backup appliance aids in the maintenance and recovery of company operations. As storage media, backup storage frequently employs both disk-to-disk (d2d) and magnetic tape systems.

The primary function of such devices is data storage and processing, which serve to improve efficiency and performance. This component comprises hard disks, USB drives, solid-state drives, and portable hard drives. There are additional storage options, such as cloud storage, AWS storage, and so on, but they are not the principal sources of storage devices. These are some of the new ways to save data online. Storage devices are an essential component of a computer system.

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Determine whether or not the following pairs of predicates are unifiable. If they are, give the most-general unifier and show th
Evgen [1.6K]

Answer:

a) P(B,A,B), P(x,y,z)

=> P(B,A,B) , P(B,A,B}  

Hence, most general unifier = {x/B , y/A , z/B }.

b. P(x,x), Q(A,A)  

No mgu exists for this expression as any substitution will not make P(x,x), Q(A, A) equal as one function is of P and the other is of Q.

c. Older(Father(y),y), Older(Father(x),John)

Thus , mgu ={ y/x , x/John }.

d) Q(G(y,z),G(z,y)), Q(G(x,x),G(A,B))

=> Q(G(x,x),G(x,x)), Q(G(x,x),G(A,B))  

This is not unifiable as x cannot be bound for both A and B.

e) P(f(x), x, g(x)), P(f(y), A, z)    

=> P(f(A), A, g(A)), P(f(A), A, g(A))  

Thus , mgu = {x/y, z/y , y/A }.

Explanation:  

Unification: Any substitution that makes two expressions equal is called a unifier.  

a) P(B,A,B), P(x,y,z)  

Use { x/B}  

=> P(B,A,B) , P(B,y,z)  

Now use {y/A}  

=> P(B,A,B) , P(B,A,z)  

Now, use {z/B}  

=> P(B,A,B) , P(B,A,B}  

Hence, most general unifier = {x/B , y/A , z/B }  

b. P(x,x), Q(A,A)  

No mgu exists for this expression as any substitution will not make P(x,x), Q(A, A) equal as one function is of P and the other is of Q  

c. Older(Father(y),y), Older(Father(x),John)  

Use {y/x}  

=> Older(Father(x),x), Older(Father(x),John)  

Now use { x/John }  

=> Older(Father(John), John), Older(Father(John), John)  

Thus , mgu ={ y/x , x/John }  

d) Q(G(y,z),G(z,y)), Q(G(x,x),G(A,B))  

Use { y/x }  

=> Q(G(x,z),G(z,x)), Q(G(x,x),G(A,B))

Use {z/x}  

=> Q(G(x,x),G(x,x)), Q(G(x,x),G(A,B))  

This is not unifiable as x cannot be bound for both A and B  

e) P(f(x), x, g(x)), P(f(y), A, z)  

Use {x/y}  

=> P(f(y), y, g(y)), P(f(y), A, z)  

Now use {z/g(y)}  

P(f(y), y, g(y)), P(f(y), A, g(y))  

Now use {y/A}  

=> P(f(A), A, g(A)), P(f(A), A, g(A))  

Thus , mgu = {x/y, z/y , y/A }.

7 0
3 years ago
Write down a program in SNOBOL thatcalculates the factorial of 7.
Sati [7]

Answer:

         n = f = 7

loop  f = gt(n,1) f * (n = n - 1) :s(loop)

         output =  f

end

Explanation:

3 0
3 years ago
Which subexpression will be solved first in the given statement?
Crazy boy [7]

Answer:

If you dont buy terraria than im going to make mrbeast buy it for you

Explanation:

reeeeeeeeeeeeeeeeeeeee

4 0
3 years ago
Jessie will make and sell the trending Baked California Maki. Her Peso mark up is 5.00. Selling price PHP 15.000. How much will
Levart [38]

Answer:

50%

Explanation:

The markup is the difference between the selling price and the cost price. If the mark up is greater than zero, it means there is a profit, if the markup is less than 0, it means there is a loss and if the markup is equal to 0, it means there is breakeven.

Percentage markup = (markup/cost price) * 100%

Selling price - cost price = markup

15 - cost price = 5

cost price = 10

Percentage markup = (markup/cost price) * 100% = (5/10) * 100% = 50%

7 0
3 years ago
Make a webpage that shows news <br>​
Nataly_w [17]
Well it all depends how you plan on making it as you would need to know Web Development or you could just copy paste code from YT
8 0
3 years ago
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