Write an equation to describe the sequence below. Use n to represent the position of a term in the sequence, where n = 1 for the first term.

7,35,175, …

To find an equation to describe the sequence, we can observe that each term is obtained by multiplying the previous term by 5.

So, the equation to describe the sequence is:

a_n = 7 * 5^(n-1)

Where:
a_n represents the nth term in the sequence.