To solve the equation \(-\frac{x}{2.9} = -3\), we can start by eliminating the negative signs:
\(\frac{x}{2.9} = 3\).
Next, multiply both sides by 2.9 to isolate \(x\):
\(x = 3 \times 2.9\).
Calculating that gives:
\(x = 8.7\).
So, the solution to the equation is \(8.7\).
Thus, the correct response is: 8.7