How are students organizing for change in the Middle East

Express the following as a function of a single angle, cos(60) cos(-20) - sin(60) sin(-20)

The marriott family bought a new apartment three years ago for $65,000. the apartment is now worth $86,515. assuming a steady rate of growth, what was the yearly rate of appreciation? what is the percent of the yearly rate of appreciation?

Write an inequality for this sentence the quotient of a number and -5 increased by 4 is at most 8