Final answer:
To find the value of abc with a = -2/5, b = 20/32, and c = -4/10, simplify b to 5/8 and multiply all three values to get 1/5, or 0.2.
Step-by-step explanation:
To evaluate the expression abc when given a = -2/5, b = 20/32, and c = -4/10, you multiply the three values together. First, simplify the fractions where possible. For b = 20/32, you can divide the numerator and the denominator by 4 to get b = 5/8. Now, multiply the simplified values of a, b, and c together.
a * b * c = (-2/5) * (5/8) * (-4/10) = 2/5 * 1 * 1/2 = 1/5.
Therefore, the result of abc is 1/5, which can also be written as 0.2.