I think the third option is correct
Answer:
For 0° ≤ x ≤ 360° we have:
x=0, 360, arccos(1/6), -arccos(1/6)
Step-by-step explanation:
Replace cos(x) by y
6y²-7y+1=0
6y²-6y-y+1=0
6y(y-1) -(y-1)=0
(y-1)(6y-1)=0
Roots:
y=1, cos(x)=1, x=0 and 360
y=1/6, cos(x)=1/6, x=arccos(1/6) and x=-arccos(1/6)
Answer:
7 5/6
Step-by-step explanation:
You can use the pythagoras theorem.
20^2=5^2+x^2
x^2=400-25
x^2=375
x = 19.36
20-19.36=0.64 feet
The answer is 0.64 feet :)
