Answer
$-45$
Work Step by Step
The product of two numbers with different signs can be found by performing the following steps:
(1) Multiply their absolute values.
$|5| \cdot |-9| = 5 \cdot 9 = 45$
(2) The product is negative.
$5(-9) = -45$
Thus, the product of the given numbers is $-45$.
