Using a proportion, solve for x

The value of x is 6, because values are doubled based on the primary value.

Step-by-step explanation:

     From the given diagram,

                       At the top first value is 4 and second value is 8

                       The logic in the top of the triangle is based an multiply by first value.

                      Let, P - First value

                             Q - Second value

                     From given, we know that

                                Q = 2 × P            (∵ P=4, Q = 2 × P = 8)

                     Refer the attachment,

                              For the vertical side of triangle,

                                    Q = 2 × P

                                        = 2 × 7

                                    Q = 14

                       From the given and attachment,

                                 x+8 = Q

                                 x+8 = 14

                                 x = 6

Result:

              The value of x is 6, because values are doubled based on the primary value is clearly in attachment.

i believe it's a.

i'm not sure on this one, most likely correct.