assuming she worked at a constant rate, how many rows had been completed before elena started working?

What is the missing step in this proof ?

Identify the number as a rational or irrational. explain. 127

Select the correct answer from each drop-down menu. a system of equations and its solution are given below. system a complete the sentences to explain what steps were followed to obtain the system of equations below. system b to get system b, the equation in system a was replaced by the sum of that equation and times the equation. the solution to system b the same as the solution to system a.]