Each interior angle of a regular polygon is 140°.Find the number of sides​

Mary used 1/7 of a spool of ribbon to complete 4 projects. she used the same amount of ribbon on each project. how much ribbon did she use on each project?

12. the amount of money in a bank account decreased by 21.5% over the last year. if the amount of money at the beginning of the year is represented by ‘n', write 3 equivalent expressions to represent the amount of money in the bank account after the decrease?

Solve the equation w^3 = 1,000 i honestly dont know how to punch this into a calculator pls