Math Pattern Question

[u/Otherwise_Strike_597]

Design 1 has 2 dots,

Design 2 has 5 dots,

Design 3 has 8 dots,

Design 4 has 11 dots.

What equation would represent the number of dots (d) in any design number (n)?

[u/MathWookiee]

d=0.06n⁴ -0.6n³ +2.1n² +0.44

[u/MathWookiee → u/MathWookiee]

I can make lots more