Is on in which every member of the population has an equal chance of being selected for the sample?

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

3. a sum of $2700 is to be given in the form of 63 prizes. if the prize is of either $100 or $25, find the number of prizes of each type.

The slope of the line whose equation is 3y = 2x - 3 is 2 2/3 3/2