4
The function below models the expected net worth, in millions of dollars, of a certain company after \( x \) years.
\[
f(x)=-0.04 x^{2}+0.48 x-0.8
\]
The equivalent form \( f(x)=-0.04(x-2)(x-10) \) reveals that the company's expected net worth is zero after sumi Cho \( \checkmark \) years and after sumi one \( \checkmark \) years.
The equivalent form \( f(x)=-0.04(x-6)^{2}+0.64 \) reveals that the company's maximum expected net worth is \( \square \) Sexat 0 os million dollars, which occurs after Setect Ons \( \qquad \) years.