Help with math problem. Find restrictions on x

Question

anonymous · Answer

|dw:1391479982871:dw|

anonymous · Answer

numbers represent degrees!!!!!

anonymous · Answer

the restrictions are whatever values that make x make 4x - 25  equal to zero...

anonymous · Answer

so, apparently according to my calculator, the restriction is x cannot equal 6.25, because 6.25*4 is 25, and 25 - 25 is zero. hope this helped

anonymous · Answer

no the answers are 21/2<x<41 but idk how the book got that???

anonymous · Answer

@MelissaHolmes  @jim_thompson5910  help me

anonymous · Answer

ummm...ok give me a sec... i am gonna look in my old textbook...

anonymous · Answer

what is this stuff called?

anonymous · Answer

OHHH... 
nevermind... i don't need to look in the book...
so what your book's answer means is that the restricted values of x are anything between 10.5 and 41.

anonymous · Answer

This is supposed to help you narrow down what the possible degrees of the angle are

anonymous · Answer

does this make sense, sort of?

anonymous · Answer

@vmathhelp ???