Question

Combine like terms to simplify the expression:
\[{1.17-0.07a+(-3.92a)}\]

Answer 1

We have $-0.07a-3.92a=(-0.07-3.92)a=-3.99a.$ Therefore, the expression simplifies to \[1.17-0.07a+(-3.92a)=\boxed{1.17-3.99a}.\]