Derek bought cups for $50 a dozen. He sold them for $10 each. What is his profit?

A. 90 degrees b. 45 degrees c. 30 degrees d. 120 degrees

With finding limits of multi variable !

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.]