Final answer:
To solve the equation, isolate x and then substitute its value into the expression.
Step-by-step explanation:
To solve the equation 2/7x + 4 = 10, we need to isolate x. First, subtract 4 from both sides of the equation:
2/7x = 6
Next, multiply both sides by 7/2 (the reciprocal of 2/7) to cancel out the coefficient of x:
(7/2)(2/7x) = (7/2)(6)
x = 21
Now, to find 2x - 4, substitute the value of x into the expression:
2(21) - 4 = 42 - 4 = 38
Therefore, the answer is 38 (option 2).