Can someone give me the right answer,

I agree, thats the only possible answer i can think of.

Good luck(:

Its been a while since I have done geometry but I think it's pretty obvious that it's ABC > DBC

your answer would be 10x - 1

answer:  

step-by-step explanation:

here x represents the height of the pole,

and, the height of the shadow of the pole is 12 feet.

also, the angle of elevation from the top of the pole is 40°,

therefore,

by the low of sine,

which is the required equation for finding the value of x,