19. Simplify the expression: \(3.5w \cdot 2x\)

To simplify the expression \(3.5w \cdot 2x\), we multiply the numerical coefficients and the variables separately.

Multiply the coefficients: \(3.5 \cdot 2 = 7\).

Multiply the variables: \(w \cdot x = wx\).

Combine the results: \(7wx\).

Ответ: \(7wx\)