Prove that the class of regular languages is closed under the drop a operation

Complete the square to determine the minimum or maximum value of the function defined by the expression. x2 − 12x − 2 a) maximum value at 38 b) minimum value at 38 c) maximum value at −38 d) minimum value at −38

Which of the fallowing best completes the sequence 5,10,15, a) 30 b) 22 c)25 d)35

How is the number of vertices for a prism related to the name of the prism