X 7. The polygons below are similar. Solve for the missing length ?
15
A
Scale Factor from A to B = 3:5

1) is right

step-by-step explanation:

or

step-by-step explanation:

we need to solve for 'x' the following equation:  

we have that:

⇒

⇒ ⇒

factorizing, we get that:

  ⇒

then, the solutions are: or

nothing extraneous has been found!