How many ways are there to choose a committee of 3 people from a group of 9 people?

Sam claims that cos x =sin y if x and y are congruent angels. is sam correct ?

Type the correct answer in the box. consider the system of linear equations below. rewrite one of the two equations above in the form ax + by = c, where a, b, and c are constants, so that the sum of the new equation and the unchanged equation from the original system results in an equation in one variable.

Awindow washer cleans 42 windows in 2 hours. at this rate, how many windows did he clean in 180 minutes.