Please help me with this question...​

What is the value of the digit 1 in the number 13?

What is the lcm of 16 and 40 ? 24 and 40 ?

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.]