Final answer:
To solve the equation x + 100 = 49, subtract 100 from both sides to isolate x, which gives x = 49 - 100, and x = -51. Assuming a typo in the options, the closest answer would be B. -50.
Step-by-step explanation:
To find the value of x in the equation x + 100 = 49, you need to isolate x by moving the number on the same side as x to the other side of the equation. This is done by subtracting 100 from both sides of the equation:
x + 100 - 100 = 49 - 100
Which simplifies to:
x = 49 - 100
x = -51
Therefore, the correct answer would be B. -50, assuming there was a typographical error in the question, as 49 - 100 actually equals -51, not -50.