Find the error with the subject-verb agreement. Select the incorrect verb and type it correctly... Modern calculators, which can compute complex sums almost instantaneously, derives from abacuses, hand-operated devices with beads that slide along rods.

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Answer: Derive

Explanation:

In this sentence the incorrect verb is derives and the correct one is derive.

Derive is considering transitional verb and the meaning of it is, for example, to receive or to take something from some source which in this case is correct since in sentence we have that something is derived from the source, in this case, hand-operated devices and other.