Answer:
x = 7
Step-by-step explanation:
The triangles shown are similar, so corresponding sides are proportional. In this case, it means we can write the proportion ...
(2x +10)/40 = 3/5
x +5 = 12 . . . . . . . . . multiply both sides by 20
x = 7 . . . . . . . . . subtract 5
