Question

Mathmatical pattern
4,6,9,13,18
I need formula as in y=x....

Answer 1

We showed you the mathematical pattern.

What do y and x represent?

I don't know what formula you need.

Answer 2

I need an equation because I have to graph the change on a number line.

Answer 3

y = (x^2 + x)/2 + 3

if x=5 for term5
y = (25+5)/2 + 3 = 18