What is the total area of these problems?

Describe the possible echelon forms of the standard matrix for a linear transformation t where t: set of real numbers is onto.

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

What set does not contain -3 the set of all real numbers the set of all integers the set of all whole numbers the set of all rational numbers