Question

what is the value of x?

Answer 1

x = 10

Answer 2

If they're similar figures, then the sides are all proportional i.e. $$\frac{x-3}{2.5}=\frac82=\frac{16}4$$

Answer 3

thank you sooooo much!

Answer 4

It's a ratio.
Looking at the bottom numbers (16 and 4) and (8 and 2), the factor is 4.
Therefore 2.5*4= x-3
x=10

Answer 5

@SplatBang actually, you're wrong. \(10=x-3; x=13\)