Learn Spanish (Latin America): Tanto el micrófono con el que transmiten como la cámara son nuevos. - Both the microphone with which they broadcast and the camera are new.

The structure tanto [X] como [Y] is a formula that groups two things together, emphasizing that both are included. Even though tanto usually means "so much" and como means "like" or "as", together in this exact pairing they mean "both [X] and [Y]". Here, it connects the microphone and the camera.

Why is the adjective nuevos masculine plural when the noun right before it is the feminine la cámara?

When an adjective describes a mix of masculine and feminine nouns, the masculine plural form is always used as the default. Because this sentence links el micrófono (masculine) and la cámara (feminine) together, the plural adjective describing them both must be the masculine nuevos.

Why do we use con el que instead of just con que or con quien?

To say "with which" in Spanish, you combine the preposition con with a relative pronoun. We use el que because it refers back to el micrófono (masculine singular). While you could technically just say con que, adding the article (el) is much more common and sounds more natural in everyday speech. We don't use quien because a microphone is an object, not a person.

Why is the verb son in the plural form?