Simplify the following expression. sinx(cscx-sinx)

Determine whether the set of whole numbers is closed under addition. explain why the set is or is not closed. give an example.

Imogene invested $8,000 in a bank account that pays 8 percent simple interest at the end of each year. her friend invested the same amount in stocks where the growth of the investment is represented as 2,000 times the square root of 2 less than the time lapsed in years. if y1 and y2 represent the amount earned in dollars and t is the time lapsed in years, which system of equations correctly represents the situation?

65% of students in your school participate in at least one after school activity. if there are 980 students in you school, how many do not participate in an after school activity?