Question

what could you do with x to find the length of vm? measure it substitute 4 in for x and simplify guess rewatch

Explanation:

If x is part of an algebraic expression representing the length of VM, substituting a known - value (in this case 4) for x and simplifying the expression would give the length. Measuring is not related to using x, guessing is not a valid mathematical method, and rewatching is not relevant to finding the length from x.

Answer:

B. Substitute 4 in for x and simplify