Answer:
x=15 exact
Step-by-step explanation:
Sine is the most necessary trig function to use considering we have the hypotenuse and we are trying to solve for x.
Set up the proportion
[tex] \frac{ \cos(60) }{1} = \frac{x}{31} [/tex]
Cross multiply to get x=cos60(31)
Multiply cos60 by 31 to get x
x=15
