I need the steps and answers please

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

Factor the expression using gcf 9b+45

Acompany charges $0.10 for each letter engraved. bobby plans to spend no more than $5.00 on the engraving on a jewelry box. write and solve an inequality to find the maximum number of letters he can have engraved.