Answer: Sure, let's plug the value of "x" into the equation for AD:
Given that "x" is equal to 0.4 (as calculated in the previous response), we'll substitute this value into the equation for AD:
AD = 10 + 8x
AD = 10 + 8 * 0.4
AD = 10 + 3.2
AD = 13.2
So, AD is equal to 13.2.