Answer: f(30) = -1
You would substitute every X with 30


So we are to merge the two equations into one, since both of the equations are equal to y. a = b, b = c therefore, a = c.

We are to isolate x.
![x[tan(72)-tan(55)]=2.2tan(55)](https://tex.z-dn.net/?f=x%5Btan%2872%29-tan%2855%29%5D%3D2.2tan%2855%29)

The value of x is approximately, 1.9047m
Then, substitute the value of x from


y = 5.862m
Round up, then the answer would be D.
30 60 90 triangle
ratio of short leg : hypo = x : 2x
given short leg x = 4 ft
so hypo a = 2x = 2 * 4 = 8
answer
a = 8 ft
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P.S.
if you need to do by using cos sin tan then
Cos (60) = Adj/Hypo = 4/a
a = 4/cos(60) as you know cos(60) = 1/2
so
a = 4 /(1/2 = 4 * 2/1 = 8
answer: a = 8 ft
Infinite, and none. Goodbye