Question

http://prntscr.com/36bkip

Answer 1

since triangles are similar, their sides are proportional

so solve for x in
\(\large \dfrac{x}{4}= \dfrac{x+15}{7}\)

Answer 2

let me make it easier
\(\large 7x = 4(x+15)\)

Answer 3

20?

Answer 4

absolutely :)

Answer 5

Thanks :)

Answer 6

welcome ^_^