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3 years ago

Which of the following is not a valid PHP variable:

Computers and Technology

1 answer:

Alex777 [14]3 years ago

3 0

Answer:

c. $10th

Explanation:

In order to declare or create a valid variable in PHP, there are rules and guidelines to follow, these the following:

1. Valid variable begins with the $ sign.

2. It must begin with a letter or the underscore character only.

3. Valid variable cannot begin with a number after the $ dollar sign.

4. It can only contain alpha-numeric characters and underscores

5. Valid variable name is case-sensitive

Hence, given these rules and guidelines, the correct answer is option C, which after starting with $ sign begins with a number character.

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The false reject rate describes the number of legitimate users who are denied access because of a failure in the biometric devic

Eduardwww [97]

Answer: Rate

Explanation:

Rate is the one that is used to describe the number of legitimate users who are denied access because there is a failure happening in the biometric device and that type of failure is also known as Type I Error.

When it comes to hypothesis testing we can say that this kind of error is considering the rejection of the null hypothesis. On the other side, there is also Type II Error who is not rejecting the false null hypothesis and it is the opposite of a Type I Error.

4 0

3 years ago

A series circuit contains a generator, two devices, and connecting wires. The resistances of the two devices are 15 ohms and 10

rjkz [21]

We know, Voltage drop = Voltage * Resistor / total resistance
Here, voltage = 75 V
Resistor for cal. = 10 Ohm
Total resistance = 10 + 15 = 25 Ohm

Substitute their values,
e = 75 * 10/25
e = 3 * 10
e = 30 V

In short, Your Answer would be Option B

Hope this helps!

6 0

4 years ago

Read 2 more answers

We investigated a program which is probably used as one component of a bigger password breaking algorithm. We determined that th

Svetlanka [38]

Answer:

i dont know

Explanation:

3 0

3 years ago

Which layer in the Transmission Control Protocol/Internet Protocol (TCP/IP) model is responsible for delivering data between two

s2008m [1.1K]

Answer:

Network.

Explanation:

The Transmission Control Protocol/Internet Protocol (TCP/IP) model is a standard networking protocol which allows network devices such as routers, switches, and host computers to interconnect and communicate with one another over a network. The Transmission Control Protocol/Internet Protocol (TCP/IP) model comprises of four (4) layers and these includes;

I. Application layer.

II. Transport layer.

III. Internet layer.

IV. Network layer.

The network layer in the Transmission Control Protocol/Internet Protocol (TCP/IP) model is responsible for delivering data between two nodes.

Basically, this layer known as network layer is the fourth layer of the Transmission Control Protocol/Internet Protocol (TCP/IP) model and it is typically responsible for the transmission of packets from one network device to another.

4 0

3 years ago

Employee names are stored using a maximum of 50 characters. This information is an example of which of the following?

enyata [817]

Answer: Data model

Explanation: Data model is the arrangement of the information in the form of table structure to maintain it in the form of database.They help in the keeping the entities in the sequence and can be tracked when required.Example- vendors records,customer record etc.

Other options are incorrect because the data retrieval is the regaining of the data from database, record instance is the parts of the database records and meta data give knowledge about other data.

8 0

4 years ago