Explanation

 The formula for the nth term of an arithmetic sequence is aₙ = a₁ + (n - 1)d, where: 

aₙ is the nth term of the sequence

a₁ is the first term of the sequence

n is the term number (e.g., 1st term, 2nd term, etc.)

d is the common difference between consecutive terms

For example, if the first term (a₁) is 2 and the common difference (d) is 3, then the 5th term (a₅) would be calculated as follows: 

a₅ = 2 + (5 - 1)3 = 2 + 4 * 3 = 2 + 12 = 14 

Explanation

This is an arithmetic sequence with common difference of 3.

The first element is 1, and total elements are 101. So, a1 = 1, d = 3 and n = 101.

Therefore, by using the formula of nth term of an arithmetic sequence, we have 301 .

Explanation

The set {0} contains exactly one element, which makes it a singleton set.

A singleton set is defined as a set that has only one element.

Explanation

Useful means مفید

Practical means مفید

Explanation

Organic chemistry is the branch of chemistry that focuses on the structure, properties, composition, reactions, and preparation of compounds containing carbon.

While many organic compounds also contain hydrogen, oxygen, nitrogen, and other elements,

The defining element in organic chemistry is carbon.

Explanation

The phenomenon where a chemical element exists in multiple crystalline forms is called allotropy

Allotropy refers to the ability of an element to exist in two or more different forms in the same physical state.

This is different from polymorphism, which is a broader term referring to any substance (not just elements) that can exist in multiple crystalline forms. 

Explanation

Explanation

Explanation

The escape velocity of a body in the gravitational field of Earth is primarily dependent on the mass of the Earth and the radius of the Earth.

It does not depend on the mass of the body or the angle at which it is thrown.

The formula for escape velocity 𝑣e is given by:

Explanation

"Applied for" is the correct phrase when referring to seeking or requesting something, such as a job.

Example: "I have applied for a new job."

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