Why is my MatLab plot blank?

Trying to do 40<x<100 for the y function below.

x=[40 50 60 70 80 90 100];

x=[40:10:100];

y =0.0000002*(x.^(1.5))/(x+198.72);

plot(x,y)

Answer 1

[David Hill]

x=40:10:100;
y =0.0000002*(x.^(1.5))./(x+198.72);%missing dot ./
plot(x,y)