Find the 20th term of an arithmetic sequence with a first term of 3 and a common difference of 5.

 The required 20-th term of the given arithmetic sequence is 98.

Step-by-step explanation:  We are given to find the 20th term of an arithmetic sequence with first term 3 and common difference 5.

We know that

the n-th term of an arithmetic sequence with first term a and common difference d is given by

For the given arithmetic sequence, we have

first term, a = 3

and

common ratio, d = 5.

Therefore, the 20-th term pf the arithmetic sequence will be

Thus, the required 20-th term of the given arithmetic sequence is 98.