A 2-ft vertical post casts a 10-in shadow at the same time a nearby cell phone tower casts a 115-ft shadow. How tall is the cell phone tower?

This can be solved with an equation.

 

now, as far as I can tell this question was made multiple choice for a reason; just start to plug in numbers. So using the answers x is either equal to 1 or 2. lets try and solve the equation plugging 2 in. When you solve for this you end up with  none of your answers have one where y<2 so x must be 1. so lets solve for x=1.
you end up getting 

The only answer where x=1 and y<4 is C sos c is your answer. Hope this helped! :)