Given that = 3.14, calculate the circumference of the circle with radius 10cm.

Gretchen is setting up for a banquet. she has 300 chairs and needs to distribute them evenly among t tables. how many chairs should she put at each table? write your answer as an expression.

Tim open up a new saving account with a $50 deposit and plant to deposit $20 per week into the same account. write an expression to represent the total amount in his savings account.

Solve the following pair of equations for x and y: ax/b_ by /a= a +b; ax - by = 2ab