Question

The rule for the pattern is add 9. What is the 50th number?

Answer 1

If the initial value is zero, the 50th would be 450.

Explanation:

Let z₀ be the starting number. Let x will be the sequence order (starting at 0). z(x) is the number at position x.

We are not told the first number in the sequence. For this example, we'll assume zero.

Since the instruction is to add 9 for each increment in x, we can write:

z(x) = z₀ + 9x

If z₀ is 0, the sequence would appear as should in the attached spreadsheet.

Assuming z₀ = 0, the 50th term (x=50) would be 450.