How are the number of House seats calculated?

Apportionments.

Explanation:

Under Article I, Section 2 of the Constitution, seats in the House of Representatives are apportioned among the states by population, as determined by the census conducted every ten years. Each state is entitled to at least one representative, however small its population.

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the right answer is d) a conference committee. it is a temporary panel formed by house and senate members in order to reconcile differences in legislation.