Final answer:
The expression -2(5j + 2k) simplifies to -10j - 4k, which matches option b) -10j + (-4k).
Step-by-step explanation:
The expression -2(5j + 2k) can be simplified by distributing the multiplication of -2 across the terms within the parentheses. We multiply -2 by 5j to get -10j, and multiply -2 by 2k to get -4k. Therefore, the expression simplifies to -10j - 4k, which corresponds to option b) -10j + (-4k) if we recognize that subtracting a positive is the same as adding a negative.