Which one would it be? answer asap
( btw the second picture attaches to the last equation of the first picture if you get confused with that. )

What is the best way to answer questions with a x expression in the question. for example 3x + 10x=?

If x is 6, then 7x= a. 13 b. 42 c. 42x d. 76

Aregular pentagon with a perimeter of 21 inches is dilated by a scale factor of 5/3 to create a new pentagon. what is the perimeter of the new pentagon?