Final answer:
To simplify the expression -12/3 x -6/15, multiply the numerators and the denominators. Then, simplify the resulting fraction by dividing both the numerator and denominator by their common factors.
Step-by-step explanation:
To simplify the expression -12/3 x -6/15, we first multiply the numerators together (-12 x -6 = 72) and the denominators together (3 x 15 = 45). So, the expression becomes 72/45.
Next, we simplify this fraction. Both 72 and 45 are divisible by 9, so we can divide both the numerator and the denominator by 9. This gives us the simplified fraction 8/5.
Therefore, the answer to -12/3 x -6/15 in simplest form is 8/5.