Simplify h(3k-12.4)

$h (3 k - 12.4)$

Apply the distributive property.

$h (3 k) + h \cdot - 12.4$

Reorder.

Rewrite using the commutative property of multiplication.

$3 h k + h \cdot - 12.4$

Move $- 12.4$ to the left of $h$ .

$3 h k - 12.4 h$