(NEED ANSWER ASAP!!!) Find the value of X in the following figures where O is the centre of the circle​.​

Ascientist wants to use a model to present the results of his detailed scientific investigation. why would a model be useful? a )because the model makes the concepts easier to understand b) because the model is easy to put together and to use c) because the model prevents other scientists from asking questions d) because the model requires the audience to pay full attention to it i don't know what to choose because between a and d a is much more likely than d because it only wants to get the attention of the audience. i'm confuse.

This is about circle theorems. someone asap : (

Solve the equation: x - 9 = -6 + 5 a. 21 b. 7 c. 14 d. 2