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jasenka [17]
3 years ago
15

Suppose a book author can be identified by an AuthorID and each book can be identified by an ISBN. Besides the identifier, an au

thor and a book each has many other attributes like name, address, email, phone, and price, title, publisher, publish year, edition, etc. In general publishing business, an author may write no book or many books but every book must have at least one author.
Computers and Technology
1 answer:
Scrat [10]3 years ago
6 0

Answer:

a) We know that atleast one or more author writes a book.

Symbol to indicate one or more is (B)

So the correct option is B

b) We know that zero to multiple books are written by any author.

Symbol to indicate zero or more is (A)

So the correct option is A

c) The fourth option is correct if we replace by many to many relationship and generate a new entity.

So the relationship betweem author and contract is one to many. So we know that there is atleast one author that represent in symbol d and books has atleast 0 that represent in symbol c.

So Fourth Option is correct d at blue side and c at red side.

d) There are two forirgn keys in table Contract one is from AuthorId and other is ISBN.

So correcct option is C

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Convert the following numbers from decimal to binary, assuming unsigned binary representation:________.
kumpel [21]

Answer:

Binary representations of following are:

A) 35 = 100011

B) 3 = 11

C) 27 = 11011

D) 16 = 10000

Explanation:

The method to generate the binary number from a decimal is :

Keep on dividing the number by 2 and keep on tracking the remainder

And the quotient is again divided and remainder is tracked so that the number is completely divided.

And then write the binary digits from bottom to top.

Please have a look at the method in below examples:

A) 35

\begin{center}\begin{tabular}{ c c c }Number & Quotient & Remainder\\ 2 & 35 & 1 \\  2 & 17 & 1 \\   2 & 8 & 0  \\ 2 & 4 & 0  \\ 2 & 2 & 0   \\ 2 & 1 & 1\end{tabular}\end{center}

Writing the remainder from bottom to top.

So, binary number is 100011

B) 3

\begin{center}\begin{tabular}{ c c c }Number & Quotient & Remainder\\ 2 & 3 & 1 \\  2 & 1 & 1 \\  \end{tabular}\end{center}

Writing the remainder from bottom to top.

So, binary equivalent is 11.

C) 27

\begin{center}\begin{tabular}{ c c c }Number & Quotient & Remainder\\ 2 & 27 & 1 \\  2 & 13 & 1 \\   2 & 6 & 0  \\ 2 & 3 & 1  \\ 2 & 1 & 1   \end{tabular}\end{center}

Writing the remainder from bottom to top.

So, binary equivalent is 11011.

D) 16

\begin{center}\begin{tabular}{ c c c }Number & Quotient & Remainder\\ 2 & 16 & 0 \\  2 & 8 & 0 \\   2 & 4 & 0  \\ 2 & 2 & 0  \\ 2 & 1 & 1   \\\end{tabular}\end{center}

Writing the remainder from bottom to top.

So, binary equivalent is 10000.

Answers are:

Binary representations of following are:

A) 35 = <em>100011</em>

B) 3 = <em>11</em>

C) 27 = <em>11011</em>

D) 16 = <em>10000</em>

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The purpose of this act was to reduce workplace hazards and implement more safety and health programs for both employers and their employees.  

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Why we can not see objects around us in the dark​
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Answer:

We see an object when light falls on it and gets reflected from its surface and enters our eyes. In a dark room, there is no source of light. no light falls on the surface of objects and we do not see them. This is why we cannot see the objects in a dark room.

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Type the correct answer in the box. Spell all words correctly.
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Answer:emphasis

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