Learn Finnish: Otan sakset tuolta pöydältä ja kuivaan hiukset. - I will take the scissors from that table and dry the hair.

Tuolta is the ablative (from) form of the demonstrative pronoun tuo (that). In Finnish, a pronoun must match the case of the noun it describes. Since you are taking scissors off the table (pöydältä), tuo also takes the -lta ending to become tuolta.

Why use the -lta/-ltä ending for from the table instead of -sta/-stä?

The endings -lta/-ltä (the ablative case) are used when moving something off an open surface, like a table. If the scissors were inside a box or drawer, you would use -sta/-stä (the elative case) to mean out of.

Why are sakset (scissors) and hiukset (hair) in their basic plural forms instead of the partitive case?

Because you are taking the entire pair of scissors and drying all the hair, meaning it is a complete action. Plural objects in complete actions take the plural nominative form, which ends in -t. This complete object form also helps tell the listener that the action will be finished in the future.

The translation says I will take and will dry, but aren't otan and kuivaan in the present tense?