5. Class 7887 has 2:7 math classes daily. How many math classes do they have
after 21 days?

Select all the correct answers. what is 221,000,000,000,000,000,000 expressed in scientific notation?

Kelly is a salesperson at a shoe store, where she must sell a pre-set number of pairs of shoes each month. at the end of each work day the number of pairs of shoes that she has left to sell that month is given by the equation s=300-15x , where s is the number of pair of shoes kelly still needs to sell and x is the number of days she has worked that month. what is the meaning of the number 300 in this equation

W-16=-12 solve each one step equation plz