Final answer:
The numerical length of NO is 2.
Step-by-step explanation:
To find the numerical length of NO, we need to calculate the length of OP and NP and then subtract them. Given that OP has a length of 10, we can substitute this value into the equation OP = 2x. Solving for x, we get x = 5. Now we can find the length of NP using the equation NO = NP - NO. Substituting the values, we get NO = (2 * 5) - (5 + 7) = 10 - 12 = -2.
However, since we are looking for the numerical length, the answer is the absolute value of -2, which is 2. Therefore, the numerical length of NO is 2.