Why does opening the air valve of a tire at a constant temperature decrease the pressure?

Write the chemical formula for a compound that is made of an element from group 1 and an element from group 17

Which of the following are sources of revenue for media companies? a. direct sales to producers b.advertising and subscriptions c. online purchase d. capital investments

Which radioisotope is used to date fossils? a. oxygen-16 b. carbon-14 c. uranium-238 d. carbon-12