luis is standing on a street in New York City looking at the top of the empire state building with a 30⁰ angle of elevation. he is 767.6 meters from the base of the empire state building. how tall is the empire state building?​

An equation where variables are used to represent known values—function notation true or false

Each person in an it department of 25 people works on at least one of 3 major projects: system security, program implementation, platform development. 10 people work on system security, 13 work on program implementation, and 12 work on platform development. 4 people work on system security and platform development, 5 people work on program implementation and platform development, and 2 people work on all three projects. how many people work on system security and program implementation?

Can someone me with #s 8, 9, and 11. with just one of the three also works. prove using only trig identities.