A class has six students. A committee of at least one student is to be formed, and one of the committee members is chosen to be the leader of that committee. In how many ways can this be done?

Mat bought a phone for $100. he has to pay $30 per mouth. if he has paid $640 in total, how many mouth has he had the phone?

Erin bought christmas cards for $2 each to send to her family and friends. which variable is the dependent variable?

Every weekday, mr. jones bikes from his home to his job. sometimes he rides along two roads, the long route that is shown by the solid lines. other times, he takes the shortcut shown by the dashed line. how many fewer kilometers does mr. jones bike when he takes the shortcut instead of the long route?